Orthopaedic Surgery - Intertrochanteric Hip Fracture

Basics

An intertrochanteric hip fracture is an extracapsular fracture of the proximal femur located between the greater and lesser trochanters.

The greater or lesser trochanter may separate as an individual fracture fragment.

These injuries are also called trochanteric or pertrochanteric fractures.

Classification

Many classification systems have been proposed, but their reproducibility is limited.

For practical treatment purposes, intertrochanteric fractures are commonly divided into:

Stable and unstable fractures.

Stable Fractures

A stable fracture generally has:

An intact or adequately reconstructed posteromedial cortex and a preserved lateral femoral wall or buttress.

These features allow the fracture to resist excessive collapse after fixation.

Unstable Fractures

Features of instability include:

Posteromedial comminution, disruption of the lateral wall, reverse-obliquity fracture configuration, subtrochanteric extension, or substantial comminution.

These patterns are more likely to shorten, collapse into varus, or fail mechanically if the fixation construct is inadequate.

Prevention

Prevention is directed primarily toward improving bone health and reducing falls.

Bone Health

Measures may include:

Adequate calcium and vitamin D intake, appropriate osteoporosis screening and treatment, antiresorptive or anabolic therapy when indicated, and regular weight-bearing exercise.

Bisphosphonates are commonly used in appropriate patients with osteoporosis.

Fall Prevention

Fall-risk reduction in older adults may include:

Canes or walkers, balance and strength training, medication review, correction of visual impairment, improved lighting, handrails, removal of loose rugs, and other home modifications.

Hip Protectors

External hip protectors may be considered in selected frail or institutionalized patients at particularly high risk of falls.

Epidemiology

Intertrochanteric fractures are substantially more common in women than men, largely because of the greater prevalence of postmenopausal osteoporosis.

Older series report female-to-male ratios ranging from approximately 2:1 to 8:1.

Incidence

Historical annual incidence has been estimated at approximately:

63 per 100,000 women and 34 per 100,000 men.

Proportion of Hip Fractures

Intertrochanteric fractures account for approximately 40–50% of all hip fractures.

Age

Incidence increases sharply with advancing age because of:

Osteoporosis, frailty, impaired balance, and increasing frequency of falls.

Risk Factors

The major risk factors are:

Advanced age, osteoporosis, frailty, gait instability, previous falls, and any condition that increases fall risk.

Pathologic Fracture

Intertrochanteric fractures may occasionally occur through abnormal bone weakened by:

Primary bone tumors, metastatic disease, or other pathologic processes.

Etiology

Most intertrochanteric fractures result from a fall, particularly in older adults.

Motor vehicle collisions are a less common but important cause, particularly in younger patients.

Mechanism of Injury

Typical mechanisms include:

Direct impact over the greater trochanter or axial loading transmitted through the femur.

Muscular forces acting on the trochanters can further displace the fragments after the fracture occurs.

Associated Conditions

Common associated conditions include:

Osteoporosis and frailty.

High-energy injuries may also be accompanied by:

Other fractures, soft-tissue trauma, neurologic injury, or vascular injury in the affected limb.

Diagnosis

Signs and Symptoms

Presentation depends partly on fracture stability and displacement.

Stable or Minimally Displaced Fractures

Some patients may remain able to stand or even walk, although weight bearing usually produces pain.

Pain is typically located in the groin, proximal thigh, or lateral hip.

Unstable or Displaced Fractures

Patients typically have:

Severe pain, inability to walk, substantial limitation of hip motion, swelling, and bruising over the lateral hip or greater trochanter.

History

The classic history is an older adult who sustains a low-energy fall from standing height.

In younger patients, the mechanism is more often high energy.

The clinician should also ask about:

Previous hip pain, preinjury mobility, osteoporosis treatment, use of anticoagulants, cognitive status, and medical comorbidities.

Physical Examination

Limb Position

A displaced intertrochanteric fracture typically produces a leg that appears:

Shortened and externally rotated.

External rotation can be pronounced because the distal fragment rotates under the influence of muscular forces, including the iliopsoas.

Inspection

Examine for:

Swelling, bruising, deformity, skin compromise, and wounds.

Hip Examination

Movement of the hip is usually extremely painful.

Forceful range-of-motion testing should be avoided once fracture is suspected.

Ipsilateral Knee and Limb Examination

The knee and remainder of the lower extremity should be assessed for associated injury, particularly after high-energy trauma.

Neurovascular Examination

Distal motor function, sensation, pulses, and capillary refill should be documented.

Imaging

Plain Radiographs

Initial imaging generally includes:

AP pelvis, AP view of the affected hip, and cross-table lateral hip radiograph.

Full-Length Femur

A full-length femoral radiograph may be useful to identify:

Additional fractures, distal deformity, previous implants, or other abnormalities relevant to surgical planning.

Occult Fracture

If the history and examination strongly suggest a hip fracture but plain radiographs are negative, MRI is the preferred test for detecting an occult fracture.

CT may be used when MRI is unavailable or contraindicated.

Treatment

General Principles

Most intertrochanteric fractures are treated surgically because fixation permits:

Earlier mobilization, earlier weight bearing, improved pain control, and reduced complications of prolonged bed rest.

Preoperative Care

Patients should generally remain protected from unrestricted weight bearing until definitive stabilization.

Traction

Routine preoperative traction has not been shown to provide meaningful benefit and is generally unnecessary.

Medical Optimization

Because many affected patients are elderly and medically complex, perioperative management should address:

Fluid status, anemia, anticoagulation, cardiac and pulmonary disease, pain control, delirium risk, nutrition, and osteoporosis.

Surgery should proceed promptly once the patient is medically optimized.

Nursing Care

Pressure-Injury Prevention

Special attention should be given to avoiding pressure over the:

Sacrum and heels.

Frequent repositioning and appropriate padding are important.

Delirium Prevention

Older patients are at high risk for acute delirium.

Useful measures include:

Frequent reorientation, adequate pain control, preservation of sleep-wake cycles, early mobilization, ensuring access to glasses and hearing aids, adequate hydration, and minimizing unnecessary sedating medications.

Nonoperative Treatment

Nonoperative management is rarely selected.

It may be considered in patients who:

Were already nonambulatory, have extremely limited life expectancy, or have medical conditions that make surgery disproportionately hazardous.

These patients still require aggressive pressure care, analgesia, pulmonary hygiene, thrombosis prevention, and gentle mobilization when possible.

Surgery

After closed or open reduction, the fracture is stabilized internally.

The implant is chosen according to fracture geometry and stability.

Sliding Hip Screw

A sliding hip screw, also called a dynamic hip screw (DHS), consists of a lag screw placed into the femoral head and neck that slides within a barrel attached to a side plate.

Mechanism

Controlled sliding permits the fracture to:

Impact and compress during weight bearing, improving bony contact and promoting union.

Indications

A sliding hip screw is particularly useful for stable intertrochanteric fracture patterns with an intact lateral wall.

Lateral Buttress

For a sliding hip screw to function properly, the lateral femoral wall must provide a mechanical stop.

If the lateral wall is deficient, uncontrolled lateralization or collapse can occur.

Cephalomedullary Nail

An intramedullary hip fixation device, usually a cephalomedullary nail, is commonly used for unstable patterns.

Indications

Particularly important indications include:

Reverse-obliquity fractures, subtrochanteric extension, lateral wall disruption, and highly comminuted unstable fractures.

The intramedullary implant itself provides a more medial load-sharing construct and can act as a buttress against excessive collapse.

Lag Screw Position

The position of the cephalic lag screw or blade within the femoral head is critical for preventing fixation failure.

Tip-to-Apex Distance

The tip-to-apex distance (TAD) is calculated by adding the distance from the tip of the lag screw to the apex of the femoral head on both the AP and lateral radiographs, corrected for magnification.

A target of approximately 25 mm or less is commonly recommended.

Failure Risk

A TAD greater than approximately 25 mm is associated with an increased risk of screw cutout and fixation failure.

Central or inferior-central placement within the femoral head is generally preferred depending on implant design.

Quality of Reduction

Successful fixation also depends on obtaining:

Appropriate neck-shaft alignment, restoration of medial cortical support, avoidance of varus, and satisfactory rotational alignment.

Good reduction is at least as important as implant selection.

Arthroplasty

Hip replacement is not the routine treatment for most intertrochanteric fractures.

However, arthroplasty may occasionally be considered in patients with:

Extreme comminution, severe preexisting hip arthritis, failed previous fixation, or fracture patterns unlikely to be reconstructed reliably.

Physical Therapy

Early rehabilitation is essential after fixation.

Mobilization

Patients should be mobilized as soon as medically safe, often beginning on the first postoperative day.

Weight Bearing

In many older patients with stable fixation, weight bearing as tolerated is encouraged.

Restrictions may be necessary in selected unstable fractures or when fixation quality is suboptimal.

Assistive Devices

A:

Walker, crutches, or cane

may be used according to balance, strength, and preinjury mobility.

Rehabilitation

Many elderly patients require a period of:

Inpatient rehabilitation, skilled nursing care, or structured home therapy

before they regain sufficient strength and independence.

Follow-Up

Main Rehabilitation Goal

The primary goal after surgery is early restoration of safe mobility while minimizing complications associated with immobility.

Prognosis

Fracture union is generally reliable because the intertrochanteric region contains well-vascularized cancellous bone.

However, recovery of overall function depends heavily on the patient’s preinjury health and mobility.

Functional Recovery

Historical studies suggest that only approximately 50% of patients return completely to their previous functional level after an intertrochanteric hip fracture.

Loss of independence is common in frail older adults.

Mortality

One-year mortality after hip fracture is substantial and is driven largely by:

Advanced age, frailty, and coexisting medical disease rather than the fracture alone.

Historical reports describe rates ranging from approximately 14–36%.

Complications

Delirium

Acute changes in mental status are common in older hospitalized patients.

Prevention and early treatment of postoperative delirium are important components of care.

Venous Thromboembolism

Deep venous thrombosis and pulmonary embolism are important complications.

Appropriate thromboprophylaxis should be used according to individual bleeding and thrombotic risk.

Options may include:

Low-molecular-weight heparin, direct factor Xa inhibitors, aspirin in selected protocols, or other anticoagulants together with mechanical prophylaxis and early mobilization.

Fixation Failure

Mechanical failure may produce:

Excessive fracture collapse, shortening, varus deformity, screw migration, or cutout through the femoral head.

Risk Factors for Mechanical Failure

Important causes include:

Poor reduction, varus alignment, inadequate fixation in the femoral head, excessive tip-to-apex distance, unstable fracture geometry, and severe osteoporosis.

Intra-Articular Penetration

The cephalic screw or blade can penetrate the femoral head and enter the hip joint if fixation fails or the implant is positioned too deeply.

This complication often requires revision surgery.

Peri-Implant Fracture

Stress concentration around the fixation device may rarely contribute to a new femoral fracture.

Nonunion

Nonunion is uncommon, historically occurring in fewer than approximately 2% of cases, because the intertrochanteric region has a rich blood supply.

Osteonecrosis

Femoral-head osteonecrosis is also uncommon compared with intracapsular femoral-neck fractures because the fracture generally lies outside the hip capsule and does not usually disrupt the main blood supply to the femoral head.

Salvage of Failed Fixation

Failed fixation with painful deformity, nonunion, or severe post-traumatic arthritis may require:

Revision fixation or conversion to total hip arthroplasty, depending on bone quality and joint condition.

Patient Monitoring

Patients should be followed clinically and radiographically until fracture healing is established.

Radiographic Surveillance

Radiographs should assess:

Fracture alignment, degree of controlled collapse, lag screw or blade position, maintenance of fixation, callus formation, and union.

Follow-up commonly continues for at least 1 year in complex cases.

CT

If union is difficult to determine on plain radiographs or nonunion is suspected, CT can help evaluate persistent fracture lines and bridging bone.

Long-Term Care

Following fracture recovery, attention should also be directed toward preventing future fragility fractures through:

Osteoporosis assessment and treatment, vitamin D optimization, fall-prevention strategies, strength and balance training, and review of modifiable risk factors.

Orthopaedic Surgery - Genu Valgum (Knock-Knee)

Basics

Genu valgum, commonly called knock-knee, describes a lower-extremity alignment in which the knees angle toward one another while the ankles remain separated.

A degree of genu valgum is a normal developmental finding in young children, particularly between approximately 2 and 4 years of age.

Normal Development

Girls normally demonstrate slightly more physiologic valgus than boys.

As growth continues, the valgus gradually decreases, and the lower extremities usually approach the typical adult alignment by approximately 6–7 years of age.

Pathologic Genu Valgum

Persistent or excessive valgus may result from disorders such as rickets, previous trauma, skeletal dysplasia, or genetic abnormalities.

Some children have persistent idiopathic genu valgum without an identifiable underlying disorder.

When substantial valgus persists beyond approximately 7 years of age, it is less likely to represent normal physiologic development.

Anatomic Location

The deformity most commonly arises from altered growth around the knee, particularly involving the distal femoral and proximal tibial physes.

The deformity may originate from the femur, tibia, or both.

Epidemiology

Pathologic genu valgum is uncommon.

The reported incidence is less than approximately 1 per 1,000 children.

Age

Patients requiring evaluation commonly present between approximately 3 and 11 years of age.

Physiologic valgus is most apparent in early childhood.

Sex

Physiologic genu valgum is somewhat more pronounced and more commonly noticed in females than males.

Risk Factors

A family history of genu valgum may increase the likelihood of persistent idiopathic deformity.

Proximal Tibial Metaphyseal Fracture

A proximal tibial metaphyseal fracture in a child, sometimes referred to as a Cozen fracture, can be followed by asymmetric overgrowth and progressive valgus deformity.

Parents should be informed of this possibility, even when the initial fracture heals uneventfully.

Genetics

Several metabolic and skeletal disorders associated with genu valgum have an inherited basis.

Certain forms of rickets are genetic, and idiopathic valgus alignment may also cluster within families.

Etiology

Potential causes include physiologic development, metabolic disease, steroid-related skeletal effects, post-traumatic growth disturbance, skeletal dysplasia, and chromosomal disorders.

Physiologic Genu Valgum

Physiologic genu valgum represents a normal stage of lower-extremity development and generally corrects spontaneously with growth.

Metabolic Disease

Rickets and renal osteodystrophy may weaken the metaphyseal bone and disturb physeal growth, resulting in progressive angular deformity.

Post-Traumatic Deformity

A proximal tibial fracture may lead to asymmetric growth and delayed valgus deformity.

The deformity can appear months after the original injury.

Skeletal Dysplasia

Conditions such as pseudoachondroplasia and metaphyseal dysplasia may produce substantial valgus because of abnormal growth around the knee.

Chromosomal Disorders

Genu valgum may also occur in association with chromosomal conditions such as Klinefelter syndrome or Down syndrome.

Associated Conditions

Important associated disorders include proximal tibial fracture, pseudoachondroplasia, renal osteodystrophy, metaphyseal dysplasia, rickets, Down syndrome, and multiple osteochondromas.

Diagnosis

Signs and Symptoms

The most common reason for presentation is parental concern regarding the appearance of the child’s legs.

Most children with physiologic genu valgum have no pain or functional limitation.

Pain

Childhood genu valgum is usually painless.

Occasionally, excessive valgus may be associated with patellofemoral discomfort or altered patellar tracking.

Adult Symptoms

Persistent severe valgus in adulthood can increase loading across the lateral compartment of the knee and may contribute to lateral compartment osteoarthritis and patellofemoral symptoms.

Physical Examination

Range of Motion

Knee range of motion should be assessed and compared bilaterally.

Associated flexion contracture, hyperextension, or rotational abnormality should be documented.

Growth Assessment

Height and weight should be measured and plotted against age-appropriate growth charts.

Short stature or abnormal growth patterns may suggest skeletal dysplasia, endocrine disease, or another systemic disorder.

Femorotibial Angle

The angle between the femoral and tibial axes can be measured clinically using a goniometer.

This provides an estimate of the degree of valgus.

Intermalleolar Distance

With the patient standing and the knees touching, the distance between the medial malleoli is measured.

An increased intermalleolar distance reflects greater valgus deformity.

Adjacent Joints

The hips and ankles should also be examined because deformity or contracture at these levels may alter apparent knee alignment.

Rotational Profile

Femoral and tibial rotation should be assessed.

Rotational abnormalities may exaggerate or mask the appearance of genu valgum.

Gait

The patient’s gait should be observed for abnormal alignment, circumduction, instability, or patellar maltracking.

Ligament Examination

The medial and lateral collateral ligaments should be tested for laxity.

Ligamentous instability may contribute to apparent or progressive valgus alignment.

Laboratory Tests

Laboratory testing is unnecessary for typical physiologic genu valgum.

It is indicated when a metabolic or endocrine disorder is suspected.

Evaluation for Rickets or Metabolic Bone Disease

Potential studies include serum calcium, phosphate, alkaline phosphatase, blood urea nitrogen, creatinine, and vitamin D levels.

Vitamin D Assessment

When evaluating rickets, measurement of 25-hydroxyvitamin D is particularly useful.

Additional studies, including 1,25-dihydroxyvitamin D and renal or endocrine investigations, may be obtained depending on the suspected cause.

Hypophosphatemic Rickets

Familial hypophosphatemic rickets is an important inherited cause of progressive lower-extremity deformity.

Serum phosphate and related metabolic studies are therefore important when this condition is suspected.

Imaging

When Imaging Is Unnecessary

Routine radiographs are generally unnecessary in children younger than approximately 6 years when the genu valgum is symmetric, painless, and clearly physiologic.

Indications for Imaging

Imaging should be obtained when the deformity is asymmetric, severe, progressive, painful, persistent beyond the expected age, associated with short stature, or accompanied by suspicion of metabolic or skeletal disease.

Standing Long-Leg Radiograph

The preferred initial study is a standing AP radiograph of the entire lower extremity from hip to ankle.

The patella should face directly forward to minimize rotational error.

Femorotibial Angle

The radiograph allows measurement of the femorotibial angle and helps determine whether the deformity arises primarily from the distal femur, proximal tibia, or both.

Mechanical Axis

The mechanical axis of the lower extremity should be assessed.

In normal alignment, a line from the center of the femoral head toward the center of the ankle passes near the central portion of the knee.

Increasing lateral displacement indicates worsening genu valgum.

Differential Diagnosis

The principal diagnostic task is distinguishing physiologic valgus from pathologic valgus.

It is also important to determine whether the deformity is developmental or acquired.

Physiologic Genu Valgum

Physiologic genu valgum occurs without evidence of rickets, skeletal dysplasia, trauma, tumor, or other disease and improves spontaneously with growth.

Skeletal Dysplasia

Important skeletal dysplasias associated with valgus include metaphyseal dysplasia, pseudoachondroplasia, and multiple osteochondromas.

Developmental Causes

Developmental causes include physiologic valgus, idiopathic persistent genu valgum, and skeletal dysplasia.

Acquired Causes

Acquired causes include metabolic disease, post-traumatic growth disturbance, and neoplastic or other physeal disorders.

Treatment

Physiologic Genu Valgum

No treatment is required for physiologic genu valgum in children younger than approximately 7 years of age when the deformity is symmetric and within normal developmental limits.

Reassurance and observation are usually sufficient.

Persistent Idiopathic Genu Valgum

If substantial deformity persists beyond approximately 7 years of age, continued observation may be appropriate until the child approaches an age at which guided growth could be considered.

Surgical treatment is generally reserved for persistent, progressive, or symptomatic deformity.

Pathologic Valgus

The underlying disorder should be addressed before or together with correction of the angular deformity.

Metabolic Disease

In patients with renal osteodystrophy, rickets, or another metabolic condition, medical control of the underlying disease is essential.

Management often requires coordination with an endocrinologist or nephrologist.

Bracing

Bracing has not been shown to reliably correct or prevent progression of structural genu valgum.

Osteotomy

Severe deformity associated with skeletal dysplasia or metabolic disease may require one or more corrective osteotomies once the underlying disease has been adequately controlled.

Post-Traumatic Valgus

Children with proximal tibial metaphyseal fractures should be followed for several years because valgus deformity can develop after apparent fracture healing.

Early Osteotomy

Early corrective tibial osteotomy is generally avoided because post-traumatic valgus may spontaneously improve and early osteotomy has historically been associated with recurrence.

Persistent Deformity

If unacceptable valgus remains after approximately 1–2 years of observation, guided growth or corrective osteotomy may be considered depending on remaining growth and severity.

Skeletal Dysplasia

Children with pseudoachondroplasia or metaphyseal dysplasia may develop progressive valgus.

Corrective osteotomy or guided growth may be required when the deformity becomes substantial or symptomatic.

Activity

No routine activity restrictions are required for physiologic genu valgum.

Children may participate in normal play and sports unless another underlying disorder requires limitation.

Physical Therapy

Physical therapy does not alter physeal growth or correct structural genu valgum.

Exercises therefore do not change the natural history of the deformity.

Therapy may still be useful for associated weakness or postoperative rehabilitation.

Surgery

The two principal surgical strategies are hemiepiphysiodesis and corrective varus osteotomy.

Hemiepiphysiodesis

Hemiepiphysiodesis is a guided-growth procedure used in skeletally immature children with sufficient growth remaining.

Principle

Growth on the medial side of the distal femoral or proximal tibial physis is temporarily slowed, allowing continued growth on the lateral side to gradually correct the valgus.

Techniques

Guided growth may be achieved using staples, transphyseal screws, or plate-and-screw tension-band devices.

Indications

Hemiepiphysiodesis may be considered when the mechanical axis passes markedly lateral to the knee, particularly into the lateral-most zones of the tibial plateau.

Pain combined with significant mechanical-axis deviation may also support intervention.

Advantages

The procedure is relatively minimally invasive, does not substantially weaken the bone, and usually allows early weight bearing.

Goal

The objective is to achieve satisfactory mechanical alignment by the time skeletal growth is completed.

Careful timing and follow-up are necessary to avoid overcorrection.

Corrective Osteotomy

Osteotomy is preferred when immediate correction is required or insufficient growth remains for guided growth to work effectively.

Procedure

The involved bone is divided, realigned into a more neutral or varus position, and stabilized with internal fixation.

The osteotomy may be performed at the distal femur, proximal tibia, or both depending on the site of deformity.

Recovery

Recovery is more demanding than after hemiepiphysiodesis because the bone is completely divided and must heal before unrestricted activity.

Surgical Success

Appropriately selected surgical correction has an overall success rate greater than approximately 90%.

Follow-Up

Prognosis

Physiologic genu valgum has an excellent prognosis and usually resolves as growth continues.

Mild deformity, particularly valgus less than approximately 15°, often improves by approximately 7–10 years of age when no metabolic or skeletal disorder is present.

Complications of Untreated Genu Valgum

Severe persistent valgus may cause patellofemoral pain, abnormal patellar tracking, gait disturbance, and increased loading of the lateral compartment of the knee.

Over many years, this can contribute to degenerative arthritis.

Surgical Complications

Potential complications include infection, compartment syndrome, neurovascular injury, recurrent deformity, and overcorrection into genu varum.

Guided-growth procedures additionally require careful monitoring to prevent excessive correction.

Patient Monitoring

Children with idiopathic genu valgum can generally be followed at approximately 12–24-month intervals while spontaneous improvement is expected.

Follow-up should document intermalleolar distance, femorotibial angle, gait, mechanical-axis alignment, symmetry, pain, growth, and progression or improvement of the deformity.

Ophthalmology – Congenital Orbital Tumors

Basics

Description

Congenital orbital tumors and developmental masses are lesions present at birth or arising during early childhood.

The most important entities in this group include:

• Dermoid cyst
• Epidermoid cyst
• Orbital teratoma

Other congenital orbital masses include:

• Lymphatic malformations
• Venous/venolymphatic malformations
• Congenital cystic eye
• Colobomatous cyst
• Encephalocele

Orbital Dermoid and Epidermoid Cysts

These are benign developmental cysts caused by sequestration of ectoderm during embryologic fusion.

They are among the:

Most common orbital masses in children

Typical locations are along bony sutures, especially the:

Frontozymgomatic suture in the superotemporal orbit

Less commonly they occur:

• Superonasally
• Deep within the orbit
• Within bone
• Within orbital soft tissue without obvious suture attachment

Dermoid vs Epidermoid Cyst

Dermoid Cyst

Lined by keratinizing stratified squamous epithelium and contains dermal appendages such as:

• Hair follicles
• Sebaceous glands
• Sweat glands

Contents may include:

• Keratin
• Sebum
• Hair

Epidermoid Cyst

Also lined by stratified squamous epithelium but:

Lacks dermal appendages

It predominantly contains:

• Desquamated keratin

Epidemiology

Dermoid and epidermoid cysts are commonly diagnosed in:

• Infancy
• Early childhood

but may present at any age.

There is no strong sex predilection.

They represent a substantial proportion of excised pediatric orbital lesions.

Orbital Teratoma

Orbital teratoma is a:

Very rare congenital germ-cell tumor

It usually presents:

• At birth
• Shortly after birth

Most are:

• Unilateral
• Mature
• Histologically benign

They can become enormous and produce marked orbital expansion.

Pathophysiology

Dermoid/Epidermoid Cysts

They arise when ectoderm becomes trapped during embryonic fusion along:

• Bony sutures
• Lines of closure

Types may be described anatomically as:

• Juxtasutural
• Sutural
• Soft-tissue/deep orbital

Slow accumulation of keratinous or sebaceous material causes progressive enlargement.

Dermoid Cyst Rupture

Spontaneous or traumatic rupture releases lipid and keratin into surrounding tissues and can cause:

Marked granulomatous inflammation

resulting in:

• Pain
• Redness
• Swelling
• Orbital inflammation

This may mimic infection.

Orbital Teratoma Pathophysiology

Teratomas arise from pluripotent germ cells and contain tissues derived from all three germ layers:

• Ectoderm
• Mesoderm
• Endoderm

They may contain:

• Fat
• Bone
• Cartilage
• Neural tissue
• Epithelium
• Cystic structures

Clinical Presentation

Dermoid / Epidermoid Cyst

Typically presents as:

• Painless
• Slowly enlarging
• Subcutaneous orbital or periocular mass

The classic lesion is:

Superotemporal near the frontozygomatic suture

On palpation it is often:

• Smooth
• Firm or fluctuant
• Nontender
• Partially mobile relative to skin

Associated Findings

Most superficial dermoids do not cause:

• Visual loss
• Elevated IOP
• Significant motility disturbance

Large or deep lesions can cause:

• Globe displacement
• Proptosis
• Diplopia
• Astigmatism
• Amblyopia

Astigmatism and Amblyopia

A lesion compressing the globe may produce:

• Corneal astigmatism
• Anisometropia

which can lead to:

Amblyopia in young children

Therefore refraction should be checked in pediatric patients.

Deep Orbital Dermoid

Deep lesions may present later with:

• Progressive proptosis
• Globe displacement
• Diplopia
• Motility restriction

They are less likely to be visible externally.

Orbital Teratoma – Clinical Presentation

The classic presentation is:

Massive unilateral proptosis present at birth

Features may include:

• Markedly enlarged orbit
• Tense eyelids
• Severe globe displacement
• Exposure keratopathy
• Conjunctival keratinization
• Corneal ulceration
• Vascular congestion

Vision may be severely compromised from:

• Optic nerve stretching/compression
• Exposure damage
• Amblyopia

History

Dermoid / Epidermoid

Usually:

• Long-standing
• Slowly progressive
• Asymptomatic

Sudden pain and swelling suggest:

• Rupture
• Hemorrhage
• Secondary inflammation

Trauma may precipitate rupture but is not the underlying cause.

Orbital Teratoma

History usually reveals:

• Proptosis at birth
• Rapid enlargement during early infancy
• Severe unilateral orbital expansion

Examination

Assess:

• Visual acuity
• Pupils
• Refraction
• Ocular alignment
• Motility
• Degree and direction of globe displacement
• Proptosis
• Exposure keratopathy
• Fundus

In young children, specifically evaluate for:

Amblyopia

Imaging – Dermoid and Epidermoid Cysts

Imaging is particularly useful for:

• Deep lesions
• Fixed lesions
• Atypical location
• Suspected intracranial extension
• Surgical planning

CT

CT is particularly useful for demonstrating:

• Relationship to orbital bone
• Suture location
• Bony remodeling
• Intraosseous extension

A dermoid is often:

• Round or ovoid
• Well circumscribed

Its density varies depending on:

• Fat
• Sebaceous material
• Keratin

A fat-fluid level may occasionally be present.

MRI

MRI provides superior soft-tissue assessment.

Signal characteristics are variable depending on cyst contents.

MRI is especially useful for:

• Deep lesions
• Intracranial extension
• Complex orbital anatomy

Epidermoid on MRI

Epidermoid cysts can show:

Restricted diffusion on diffusion-weighted imaging

which may help distinguish them from other cystic lesions.

Imaging – Orbital Teratoma

Both CT and MRI usually demonstrate a:

Large heterogeneous, multiloculated orbital mass

containing mixtures of:

• Solid tissue
• Cystic components
• Fat
• Calcification
• Bone

CT in Teratoma

CT is particularly good for identifying:

• Calcification
• Ossification
• Orbital expansion
• Bony remodeling

The combination of:

Fat + fluid/cystic tissue + calcification

strongly suggests teratoma.

MRI in Teratoma

MRI better defines:

• Soft-tissue components
• Optic nerve relationship
• Globe compression
• Intracranial extension

Pathology

Dermoid Cyst

Histology shows:

• Keratinizing stratified squamous epithelium
• Hair follicles
• Sebaceous glands
• Sweat glands

Inflammatory giant-cell reaction may occur after rupture.

Epidermoid Cyst

Histology shows:

• Keratinizing squamous epithelial lining
• Keratinaceous contents
• No dermal appendages

Teratoma

A mature teratoma contains differentiated tissue from all three germ layers.

Grossly it may be:

• Solid
• Cystic
• Multiloculated
• Partially calcified or ossified

Most congenital orbital teratomas are mature and benign.

Differential Diagnosis

The differential for an orbital mass in an infant or child includes:

• Infantile hemangioma
• Venous malformation
• Lymphatic malformation
• Rhabdomyosarcoma
• Optic pathway glioma
• Neuroblastoma metastasis
• Retinoblastoma with orbital extension
• Leukemia/chloroma
• Langerhans cell histiocytosis
• Orbital cellulitis
• Abscess
• Lacrimal lesions
• Mucocele
• Encephalocele
• Colobomatous cyst
• Congenital cystic eye

Infantile Hemangioma

Previously often called capillary hemangioma.

Usually develops during the first weeks of life rather than being fully developed at birth.

May cause:

• Eyelid swelling
• Proptosis
• Globe displacement
• Astigmatism
• Amblyopia

It is distinguished from venous/lymphatic malformations by its characteristic proliferative and involutional course.

Lymphatic Malformation

Previously called lymphangioma.

It is a congenital vascular malformation that may involve:

• Eyelid
• Conjunctiva
• Orbit

It often enlarges gradually but may suddenly expand from:

• Intralesional hemorrhage
• Upper respiratory infection

MRI frequently demonstrates:

• Multiloculated cystic spaces
• Fluid-fluid levels after hemorrhage

Rhabdomyosarcoma

The most important malignant pediatric orbital differential.

Typical features:

• Rapidly progressive proptosis
• Eyelid swelling
• Globe displacement
• First decade of life

Unlike a dermoid, it generally enlarges over:

Days to weeks

rather than years.

Optic Pathway Glioma

Usually presents with:

• Slowly progressive visual loss
• Optic atrophy or disc swelling
• Proptosis with intraorbital optic nerve involvement

It is strongly associated with:

NF1

MRI demonstrates:

• Fusiform enlargement of the optic nerve

Modern management is generally observation or systemic therapy when progressive, not routine surgical excision.

Neuroblastoma

Orbital metastatic neuroblastoma may present with:

• Proptosis
• Periorbital ecchymosis
• Eyelid swelling

Bilateral orbital disease is particularly suggestive.

Congenital Cystic Eye

A rare developmental anomaly caused by failure of normal globe formation.

The orbit contains:

• Cystic primitive neuroectodermal/ocular tissue

with no normally developed eye.

Encephalocele

A congenital skull defect may permit herniation of:

• Meninges
• Brain tissue

into or near the orbit.

Imaging before surgery is essential because of intracranial communication.

Colobomatous Cyst

Usually occurs with:

• Microphthalmia
• Inferior ocular coloboma

A cyst extends through the embryonic fissure defect and may occupy part of the orbit.

Treatment – Dermoid/Epidermoid Cyst

Small, asymptomatic lesions may sometimes be observed.

Surgical excision is generally favored when there is:

• Progressive enlargement
• Cosmetic deformity
• Pain
• Recurrent inflammation
• Globe displacement
• Astigmatism
• Amblyopia risk
• Exposure to repeated trauma
• Diagnostic uncertainty

Surgical Excision

The goal is:

Complete removal of the cyst with the capsule intact

because rupture can cause:

• Intense inflammation
• Foreign-body granuloma
• Incomplete removal
• Recurrence

If rupture occurs intraoperatively, copious irrigation and removal of cyst contents are important.

Deep Dermoid

Deep orbital dermoids require careful preoperative imaging because they may:

• Extend through sutures
• Cause bony remodeling
• Have intracranial extension

Surgical approach depends on location and extent.

Treatment – Orbital Teratoma

The main treatment is:

Early surgical excision

Goals are to:

• Preserve the globe when possible
• Protect visual potential
• Reduce exposure complications
• Preserve orbital and facial growth
• Achieve good cosmesis

Globe Preservation

Modern surgery emphasizes globe-sparing removal whenever technically possible.

Because most congenital orbital teratomas are benign:

Radical surgery should be avoided when adequate complete excision can preserve the eye and orbit.

Exenteration

Orbital exenteration is now:

Rarely required

and reserved for extraordinary cases in which the mass cannot otherwise be safely controlled or the orbital structures are irreversibly compromised.

Postoperative Care

Monitor for:

• Residual or recurrent lesion
• Visual impairment
• Amblyopia
• Strabismus
• Orbital asymmetry
• Exposure disease
• Need for reconstructive surgery

Follow-Up – Dermoid/Epidermoid

If observation is selected, monitor for:

• Growth
• New pain
• Inflammation
• Globe displacement
• Visual effects

After complete excision, recurrence is uncommon.

Follow-Up – Teratoma

Follow-up should assess:

• Recurrence
• Orbital development
• Globe position
• Vision
• Amblyopia
• Cosmetic development

Repeat imaging is appropriate when:

• Excision was incomplete
• Pathology is atypical
• Recurrence is suspected

Prognosis

Dermoid/Epidermoid Cysts

Prognosis is:

Excellent

Most children maintain normal vision if:

• Astigmatism is detected
• Amblyopia is treated
• Complicated rupture is avoided

Complete excision is usually curative.

Orbital Teratoma

Systemic prognosis is generally excellent because most congenital orbital teratomas are:

Mature and benign

Visual prognosis is more variable.

It depends on:

• Duration and severity of proptosis
• Optic nerve compression
• Exposure keratopathy
• Degree of globe distortion
• Amblyopia

Even when the globe can be preserved, useful vision may be limited.

Complications

Dermoid/Epidermoid

Potential complications include:

• Cyst rupture
• Granulomatous inflammation
• Pain
• Globe displacement
• Astigmatism
• Amblyopia
• Recurrence after incomplete excision

Orbital Teratoma

Potential complications include:

• Massive proptosis
• Exposure keratopathy
• Corneal ulceration
• Optic nerve injury
• Permanent visual loss
• Amblyopia
• Orbital/facial asymmetry
• Rare recurrence

Malignant transformation of a mature congenital orbital teratoma is exceedingly uncommon.

Ophthalmology Pearls

• Dermoid cyst is one of the most common orbital masses of childhood.
• The classic dermoid is a painless superotemporal mass at the frontozygomatic suture.
• Dermoid cysts contain skin appendages; epidermoid cysts do not.
• Sudden painful enlargement of a previously quiet dermoid suggests rupture with granulomatous inflammation.
• Large orbital dermoids can induce astigmatism and amblyopia, so refraction matters in children.
• CT is particularly useful for bone and calcification; MRI is better for soft tissue and intracranial extension.
• Epidermoid cysts characteristically may show restricted diffusion on MRI.
• Orbital teratoma classically causes massive unilateral proptosis at birth.
• A teratoma containing fat, cystic tissue, and calcification on imaging is highly characteristic.
• Mature orbital teratomas contain tissue from all three germ layers: ectoderm, mesoderm, and endoderm.
• Complete dermoid excision should ideally preserve the capsule because rupture increases inflammation and recurrence risk.
• Modern teratoma surgery aims for globe preservation, with exenteration reserved for exceptional cases.
• In a child with rapidly progressive proptosis, always exclude rhabdomyosarcoma.
• Use modern terminology: infantile hemangioma rather than capillary hemangioma, and lymphatic malformation rather than lymphangioma.

Ophthalmology – Orbital Rhabdomyosarcoma

Basics

Description

Orbital rhabdomyosarcoma (RMS) is a highly malignant mesenchymal tumor showing skeletal muscle differentiation.

It is the:

Most common primary malignant orbital tumor of childhood

Orbital RMS can arise from primitive mesenchymal cells even in tissues without mature skeletal muscle.

It may involve:

• Orbit
• Eyelid
• Conjunctiva
• Extraocular muscles
• Adjacent paranasal structures

Epidemiology

Rhabdomyosarcoma is predominantly a pediatric malignancy.

Typical features include:

• Most cases occur in children
• Mean age for orbital disease is approximately the first decade of life
• Slight male predominance
• Orbital tumors constitute a minority of all pediatric RMS cases

Orbital RMS usually presents earlier than many other RMS sites because even a small orbital mass produces visible signs.

Important Clinical Principle

In a child with:

Rapidly progressive unilateral proptosis over days to weeks

orbital rhabdomyosarcoma must be considered urgently.

It can initially resemble:

• Orbital cellulitis
• Idiopathic orbital inflammation
• Hemorrhage
• Benign orbital mass

Risk Factors

Most cases are:

Sporadic

Established syndromic associations include:

• Li-Fraumeni syndrome
• Neurofibromatosis type 1
• Costello syndrome
• Noonan-spectrum/RASopathy syndromes
• Beckwith-Wiedemann spectrum in selected patients

Older reports linked parental recreational drug exposure with RMS risk, but these associations are not sufficiently established to be used clinically as major causal risk factors.

Genetics and Molecular Biology

Molecular classification has become increasingly important.

Embryonal RMS

Usually lacks FOXO1 fusion.

May show alterations involving:

• RAS pathway
• TP53
• Other developmental signaling pathways

Alveolar RMS

Classically associated with:

• PAX3-FOXO1
• PAX7-FOXO1

gene fusions.

FOXO1 fusion-positive RMS generally has a less favorable prognosis than fusion-negative disease.

Modern risk stratification increasingly relies more on:

Fusion status

than on morphology alone.

Pathology

RMS is traditionally part of the:

Small round blue cell tumor

group.

Tumor cells may show skeletal muscle differentiation with:

• Eosinophilic cytoplasm
• Rhabdomyoblasts
• Cross-striations in more differentiated cells

Immunohistochemistry commonly demonstrates:

• Desmin
• Myogenin
• MyoD1

Histologic Types

Modern categories include:

• Embryonal RMS
• Alveolar RMS
• Spindle cell/sclerosing RMS
• Pleomorphic RMS, primarily an adult tumor

Embryonal RMS

This is the most common histologic type in orbital disease.

It generally carries a more favorable prognosis than classic fusion-positive alveolar RMS.

Botryoid Pattern

Botryoid RMS is not considered a completely separate major histologic category.

It represents a characteristic grape-like growth pattern of embryonal RMS arising beneath epithelial surfaces.

In the orbit, an anterior lesion may occasionally appear as:

• Polypoid
• Grape-like
• Subconjunctival mass

Alveolar RMS

Alveolar RMS may have:

• More aggressive biologic behavior
• Greater metastatic potential

especially when FOXO1 fusion-positive.

Pathophysiology

Tumor growth causes:

• Local tissue infiltration
• Orbital mass effect
• Globe displacement
• Proptosis
• Compression of ocular structures

Advanced disease may extend into:

• Paranasal sinuses
• Intracranial structures
• Adjacent facial tissues

Clinical Presentation

Typical onset is:

Rapid over several days to weeks

Common symptoms and signs include:

• Proptosis
• Eyelid swelling
• Orbital mass
• Chemosis
• Globe displacement
• Strabismus
• Diplopia

Pain may occur but is not always present.

Proptosis

The classic presentation is:

Rapidly progressive unilateral painless proptosis

However, inflammatory features may make the lesion appear painful or infectious.

Globe Displacement

Globe displacement depends on tumor location.

A superonasal lesion may displace the globe:

• Inferiorly
• Temporally

The direction of displacement helps localize the orbital mass.

Eyelid and Conjunctival Findings

Possible findings include:

• Eyelid edema
• Ptosis
• Conjunctival injection
• Chemosis
• Visible conjunctival mass

Anterior tumors may be directly visible.

Vision

Visual acuity may initially remain relatively preserved.

Reduced vision suggests:

• Optic nerve compression
• Corneal exposure
• Severe proptosis
• Macular or retinal involvement
• Advanced orbital disease

Ocular Motility

Patients may develop:

• Restricted motility
• Diplopia
• Strabismus

because of:

• Direct muscle involvement
• Mass effect
• Mechanical displacement

Fundus Examination

Possible findings include:

• Choroidal folds
• Optic disc edema
• Venous congestion
• Optic atrophy in advanced disease

History

Ask about:

• Duration and rate of progression
• Pain
• Fever
• Recent infection
• Trauma
• Visual decline
• Diplopia
• Prior malignancy
• Family history of cancer predisposition syndromes

A history of trauma can be misleading and should not delay evaluation of a rapidly growing orbital mass.

Examination

Perform:

• Visual acuity
• Pupils
• Color vision
• Proptosis measurement
• Eyelid examination
• Ocular motility
• Globe displacement assessment
• Slit-lamp examination
• Dilated fundus examination
• Regional lymph node examination

Red Flags

Features raising concern for RMS include:

• Rapidly increasing unilateral proptosis
• Orbital mass in a child
• Progressive eyelid swelling without infectious explanation
• Globe displacement
• Poor response to antibiotics
• Persistent or enlarging “inflammatory” orbital lesion

Imaging

MRI

MRI of the orbits and brain with contrast is generally the preferred imaging study.

MRI provides excellent evaluation of:

• Tumor extent
• Orbital apex
• Optic nerve
• Extraocular muscles
• Intracranial extension
• Adjacent sinus involvement

MRI Appearance

Orbital RMS typically appears as:

• Soft-tissue mass
• T1 iso- to hypointense
• T2 hyperintense
• Contrast enhancing

It may be:

• Well circumscribed
• Infiltrative
• Heterogeneous

Imaging features are not pathognomonic.

CT

CT is particularly useful for evaluating:

• Bone destruction
• Calcification
• Paranasal sinus involvement

Bone erosion is less common in early orbital RMS than in some other aggressive orbital malignancies.

Typical Location

Orbital RMS often occurs in the:

• Superior orbit
• Superonasal orbit

but it can arise anywhere.

It is commonly:

• Extraconal

although intraconal or diffuse disease can occur.

Systemic Staging

Once RMS is diagnosed, systemic staging is required.

Evaluation may include:

• Chest CT
• Regional lymph node assessment
• MRI of primary site
• FDG PET/CT in many modern protocols
• Bone marrow evaluation in selected higher-risk patients
• Bone imaging depending on risk group and protocol

Staging should follow a pediatric oncology protocol.

Common Metastatic Sites

Potential metastatic sites include:

• Lung
• Bone
• Bone marrow
• Regional lymph nodes

Orbital RMS has a relatively low frequency of nodal spread compared with some head and neck RMS sites.

Biopsy

Definitive diagnosis requires:

Tissue biopsy

The surgical goal is to obtain adequate diagnostic tissue while preserving:

• Vision
• Globe
• Extraocular muscles
• Orbital structures

Surgical Approach

Modern treatment does not generally require aggressive complete orbital excision.

Depending on tumor size and accessibility:

• Incisional biopsy
• Limited excisional biopsy

may be performed.

Wide resection that produces major functional or cosmetic morbidity should generally be avoided because RMS is highly responsive to:

• Chemotherapy
• Radiotherapy

Pathologic Evaluation

Specimens should undergo:

• Histopathology
• Immunohistochemistry
• Molecular testing

including assessment for:

FOXO1 fusion status

when appropriate.

Differential Diagnosis

Important pediatric orbital differentials include:

• Orbital cellulitis
• Idiopathic orbital inflammatory disease
• Lymphatic malformation
• Venous malformation
• Dermoid cyst
• Neuroblastoma metastasis
• Leukemia/chloroma
• Langerhans cell histiocytosis
• Ewing sarcoma
• Optic pathway glioma

Orbital Cellulitis vs RMS

Orbital cellulitis usually has:

• Fever
• Pain
• Sinusitis
• Leukocytosis
• Rapid inflammatory onset

RMS may mimic cellulitis but often shows:

• Persistent mass
• Progressive proptosis
• Limited systemic inflammatory symptoms
• Poor response to antimicrobial treatment

Neuroblastoma Metastasis

Orbital neuroblastoma metastasis often presents with:

• Bilateral orbital disease
• Periorbital ecchymosis
• Proptosis

whereas orbital RMS is usually:

• Primary
• Unilateral

Treatment Principles

Modern therapy is multidisciplinary and generally combines:

• Chemotherapy
• Radiotherapy when indicated
• Limited surgery for diagnosis/local control

Management should involve a pediatric sarcoma oncology team.

Chemotherapy

Systemic chemotherapy is essential because RMS is treated as a systemic-risk malignancy even when apparently localized.

A common backbone includes:

• Vincristine
• Actinomycin D / dactinomycin
• Cyclophosphamide

often referred to as:

VAC chemotherapy

Alternative Chemotherapy Regimens

Depending on:

• Risk group
• Histology
• FOXO1 fusion status
• Clinical trial protocol

regimens may also include:

• Ifosfamide
• Etoposide
• Irinotecan
• Vinorelbine
• Other agents

Therapy is protocol-driven rather than based solely on orbital findings.

Risk Stratification

Modern treatment incorporates:

• Tumor site
• Tumor size
• Nodal status
• Metastatic status
• Surgical/pathologic group
• Histology
• FOXO1 fusion status

The orbit is considered a:

Favorable primary site

in many pediatric RMS classification systems.

Surgical Grouping

Traditional Intergroup Rhabdomyosarcoma Study grouping includes:

Group I

Complete resection with negative margins

Group II

Microscopic residual disease and/or selected nodal involvement

Group III

Gross residual disease after biopsy or incomplete resection

Group IV

Distant metastatic disease at diagnosis

Most orbital RMS cases historically fall into:

Group III

because biopsy rather than mutilating complete excision is preferred.

Radiotherapy

Radiation is an important component of local control in many patients with:

• Residual tumor
• Higher-risk disease
• Fusion-positive disease
• Inadequate response to chemotherapy

Modern techniques aim to minimize dose to:

• Lens
• Retina
• Optic nerve
• Lacrimal gland
• Pituitary
• Developing facial bones

Modern Radiation Techniques

Depending on availability and protocol, options include:

• Intensity-modulated radiotherapy
• Proton beam therapy
• Other conformal techniques

Proton therapy may reduce dose to surrounding developing tissues in selected children.

Timing of Radiation

Radiotherapy timing and dose are individualized based on:

• Risk category
• Response to chemotherapy
• Residual disease
• Age
• Molecular features

Fixed historical dose schedules should not be applied outside modern pediatric oncology protocols.

Role of Surgery

Surgery is primarily used for:

• Diagnostic biopsy
• Limited safe excision
• Selected residual/recurrent disease

Orbital exenteration is almost never part of routine initial treatment.

Modern combined therapy has largely eliminated the need for disfiguring radical surgery.

Recurrence

Recurrence may be:

• Local
• Regional
• Distant

Late recurrence is uncommon but possible.

Any new orbital symptoms after treatment require prompt evaluation.

Management of Recurrent Disease

Treatment may involve:

• Salvage chemotherapy
• Radiation if not previously maximized
• Surgery in selected cases
• Targeted or investigational therapy

Management should occur at a specialized pediatric sarcoma center.

Referral

Any child with a suspicious rapidly enlarging orbital mass should be referred urgently to:

• Pediatric ophthalmology
• Orbital/ocular oncology
• Pediatric oncology

Additional teams may include:

• Radiation oncology
• Pathology
• Genetics
• Neurosurgery
• ENT/head and neck surgery

Genetic Counseling

Genetic evaluation should be considered when there is:

• Strong family history of cancer
• Very young age
• Multiple tumors
• Features of Li-Fraumeni syndrome
• NF1
• Other cancer-predisposition syndrome

Follow-Up

Follow-up is intensive during and after treatment.

Monitoring includes:

• Clinical orbital examination
• Visual function
• MRI of the primary site
• Surveillance for systemic recurrence
• Treatment-related toxicity

Intervals are determined by oncology protocol.

Ophthalmic Monitoring

Monitor for:

• Visual acuity
• Pupillary abnormalities
• Ocular alignment
• Motility
• Exposure keratopathy
• Cataract
• Dry eye
• Radiation retinopathy
• Radiation optic neuropathy

Long-Term Survivorship

Because cure rates are high, long-term treatment effects are increasingly important.

Potential late complications include:

• Cataract
• Dry eye
• Keratoconjunctivitis
• Orbital hypoplasia
• Facial asymmetry
• Strabismus
• Retinal vascular injury
• Optic neuropathy
• Endocrine dysfunction
• Secondary malignancy

Radiation-Related Ocular Complications

Possible complications include:

• Cataract
• Dry eye
• Lacrimal gland dysfunction
• Radiation keratopathy
• Radiation retinopathy
• Optic neuropathy
• Orbital bone growth disturbance

Risk depends on:

• Dose
• Radiation field
• Patient age
• Technique

Chemotherapy Complications

Possible adverse effects include:

• Myelosuppression
• Infection
• Neuropathy
• Hemorrhagic cystitis
• Gonadal toxicity
• Secondary malignancy

depending on agents used.

Prognosis

The prognosis for localized orbital RMS is generally:

Excellent

with modern multimodal therapy.

Long-term survival is often:

>90%

for localized favorable-site orbital disease.

Favorable Prognostic Factors

Include:

• Localized orbital primary
• Embryonal/fusion-negative biology
• Younger age
• No metastatic disease
• Good response to chemotherapy
• Effective local control

Poor Prognostic Factors

Include:

• Distant metastasis
• FOXO1 fusion-positive tumor
• Incomplete local control
• Recurrent disease
• Unfavorable molecular biology

Visual Prognosis

Vision may be preserved if:

• Disease is diagnosed early
• Optic nerve is not severely compressed
• Treatment-related ocular toxicity is minimized

Visual morbidity may result from:

• Tumor itself
• Radiation
• Surgery
• Chemotherapy
• Amblyopia

Complications

Disease-related complications include:

• Progressive proptosis
• Exposure keratopathy
• Optic nerve compression
• Visual loss
• Intracranial extension
• Metastasis

Treatment-related complications include:

• Cataract
• Dry eye
• Radiation retinopathy
• Optic neuropathy
• Orbital growth disturbance
• Secondary malignancy

Ophthalmology Pearls

• Orbital rhabdomyosarcoma is the most common primary malignant orbital tumor of childhood.
• The classic presentation is rapidly progressive unilateral proptosis over days to weeks.
• It may mimic orbital cellulitis or idiopathic orbital inflammation.
• Embryonal RMS is the most common orbital subtype.
• FOXO1 fusion status is now an important prognostic and treatment-stratification marker, especially in alveolar-type disease.
• MRI of the orbits and brain with contrast is the preferred imaging study; CT is useful for bone assessment.
• Definitive diagnosis requires biopsy, but aggressive complete orbital excision is usually unnecessary.
• Modern management relies on systemic chemotherapy plus risk-adapted radiotherapy.
• The standard chemotherapy backbone commonly includes vincristine, dactinomycin, and cyclophosphamide (VAC).
• The orbit is considered a favorable RMS primary site, and localized disease now has an excellent survival rate, often above 90%.
• Orbital exenteration is rarely required in modern initial management.
• Long-term survivors require surveillance for cataract, dry eye, orbital hypoplasia, radiation retinopathy, optic neuropathy, endocrine abnormalities, and secondary malignancy.

Ophthalmology – Optic Nerve Hypoplasia

Basics

Description

Optic nerve hypoplasia (ONH) is a congenital, nonprogressive developmental anomaly in which the optic nerve contains fewer retinal ganglion cell axons than normal.

Typical features include:

• Abnormally small optic disc
• Pale or gray disc appearance
• Double-ring sign
• Reduced retinal nerve fiber layer
• Variable visual impairment

ONH may be:

• Unilateral
• Bilateral
• Symmetric
• Asymmetric

Bilateral disease is more common.

Visual acuity may range from:

20/20 to no light perception

and cannot be predicted reliably from disc appearance alone.

Epidemiology

ONH is one of the most common congenital optic nerve abnormalities encountered in pediatric ophthalmology.

Reported incidence and prevalence vary considerably between populations.

Recognition has increased because of:

• Better pediatric eye screening
• Improved neuroimaging
• Greater awareness of endocrine and neurologic associations

Risk Factors

Most cases occur without a clearly identifiable cause.

Reported prenatal associations include:

• Maternal diabetes
• Young maternal age
• Primiparity
• Prematurity
• Low birth weight
• Poor maternal weight gain
• Gestational bleeding
• Prenatal alcohol exposure
• Certain teratogenic drug exposures

Older reports described associations with agents such as:

• Phenytoin
• Quinine
• PCP
• LSD

but many of these associations are based on limited observational evidence.

Superior Segmental Optic Nerve Hypoplasia

A specific subtype is:

Superior segmental optic nerve hypoplasia

also called:

Topless disc syndrome

It is strongly associated with:

Maternal diabetes

Typical findings include:

• Superior optic disc pallor
• Superior RNFL thinning
• Abnormal superior vessel entry
• Corresponding inferior visual field defect

Genetics

Most ONH is sporadic.

Rare cases are associated with developmental genes including:

• HESX1
• SOX2
• OTX2
• PAX6
• Other genes involved in forebrain and pituitary development

HESX1 variants have been associated with:

• Septo-optic dysplasia
• Pituitary abnormalities
• Optic nerve hypoplasia

Familial recurrence is uncommon unless a defined genetic syndrome is present.

Pathophysiology

ONH results from:

Reduced development or survival of retinal ganglion cell axons

Possible mechanisms include:

• Abnormal axonal guidance
• Excessive developmental apoptosis
• Abnormal forebrain development
• Prenatal injury to developing visual pathways

The underlying structural deficit is permanent.

Pathology

Histologically there is:

• Reduced retinal ganglion cell population
• Reduced RNFL
• Fewer optic nerve axons
• Small optic nerve caliber

Associated Conditions

ONH may occur with abnormalities involving:

• Pituitary gland
• Hypothalamus
• Corpus callosum
• Septum pellucidum
• Cerebral cortex
• White matter

Septo-Optic Dysplasia

The classic concept of septo-optic dysplasia (SOD) includes combinations of:

• Optic nerve hypoplasia
• Midline brain abnormality
• Pituitary hormone deficiency

Traditionally, absence of the septum pellucidum was emphasized.

However:

The absence of the septum pellucidum is neither necessary nor sufficient for endocrine disease.

A child may have major pituitary dysfunction even with relatively normal brain imaging.

Endocrine Dysfunction

Endocrine abnormalities are among the most important associations.

Potential deficiencies include:

• Growth hormone
• ACTH/cortisol
• TSH
• Gonadotropins
• Antidiuretic hormone

Clinical consequences may include:

• Growth failure
• Hypoglycemia
• Central hypothyroidism
• Adrenal insufficiency
• Diabetes insipidus
• Precocious or delayed puberty

Important Endocrine Principle

A normal endocrine evaluation in infancy does not guarantee normal pituitary function later.

Some deficiencies emerge during childhood.

Therefore:

Long-term endocrine surveillance is important.

Neonatal Warning Signs

Possible early clues to pituitary dysfunction include:

• Prolonged neonatal jaundice
• Hypoglycemia
• Seizures
• Poor feeding
• Failure to thrive
• Micropenis
• Cryptorchidism
• Abnormal temperature regulation

CNS Abnormalities

Associated cerebral abnormalities may include:

• Corpus callosum hypoplasia
• Agenesis of corpus callosum
• Schizencephaly
• Cortical heterotopia
• Periventricular leukomalacia
• Encephalomalacia

Developmental Delay

Developmental delay is more common in:

• Bilateral ONH
• Severe visual impairment
• Corpus callosum abnormalities
• Hypothyroidism
• Other cerebral malformations

Potential problems include:

• Motor delay
• Language delay
• Cognitive impairment
• Behavioral difficulties

Diagnosis

Diagnosis is primarily clinical.

The main goals are to:

1. Confirm ONH.
2. Determine visual function.
3. Identify treatable amblyopia or refractive error.
4. Detect associated endocrine and neurologic disease.

History

Ask about:

• Poor visual behavior
• Nystagmus
• Strabismus
• Developmental delay
• Seizures
• Growth abnormalities
• Polyuria or polydipsia
• Neonatal jaundice
• Hypoglycemic episodes
• Maternal diabetes
• Prenatal exposures
• Family history of visual or developmental disorders

Presentation

Bilateral ONH

Often presents in infancy with:

• Poor fixation
• Reduced visual responsiveness
• Nystagmus

Nystagmus commonly appears during the first few months of life.

Unilateral ONH

May present later with:

• Strabismus
• Amblyopia
• Failed vision screening
• Incidental discovery

Visual Acuity

Vision can range from:

• Normal
• Mildly impaired
• Profoundly impaired
• NLP

Disc size alone does not reliably predict final acuity.

Pupillary Examination

A relative afferent pupillary defect may be present with:

• Unilateral ONH
• Markedly asymmetric bilateral ONH

Optic Disc Appearance

Typical findings include:

• Small optic disc
• Pale or gray disc
• Reduced neuroretinal tissue
• Double-ring sign
• Abnormal vessel pattern

Double-Ring Sign

The double-ring sign consists of:

• Small true optic nerve head
• Surrounding pale or pigmented ring corresponding to the larger scleral canal and surrounding tissue

It is a classic clue to ONH.

Disc–Macula Relationship

Because the optic disc is unusually small, the distance between:

• Optic disc center
• Fovea

appears disproportionately large relative to disc diameter.

A reduced:

disc diameter / disc–macula distance ratio

supports the diagnosis.

A value around ≤0.35 is often considered suggestive, though measurements vary.

Retinal Vessels

Retinal vessels may appear:

• Relatively large compared with the disc
• Tortuous
• Abnormally arranged

Visual Fields

When reliable testing becomes possible, defects may include:

• Generalized constriction
• Arcuate defect
• Central defect
• Altitudinal defect
• Sectoral field loss

Superior segmental ONH classically causes:

Inferior field loss

Optical Coherence Tomography

OCT can demonstrate:

• Reduced RNFL
• Reduced ganglion cell layer
• Small optic nerve head

It is useful for:

• Confirming structural hypoplasia
• Documenting asymmetry
• Distinguishing ONH from optic atrophy

Pediatric normative databases remain a limitation.

Fundus Photography

Useful for documenting:

• Disc morphology
• Disc size
• Double-ring sign
• Stability over time

ONH itself should remain structurally stable.

MRI

MRI of the brain and orbits is usually recommended in children with ONH to evaluate for:

• Pituitary abnormalities
• Hypothalamic abnormalities
• Corpus callosum abnormalities
• Midline brain defects
• Cortical malformations

MRI Pituitary Findings

Possible abnormalities include:

• Pituitary hypoplasia
• Abnormal pituitary stalk
• Ectopic posterior pituitary

An ectopic posterior pituitary is strongly associated with:

Anterior pituitary hormone deficiency

However:

Normal pituitary anatomy does not exclude endocrinopathy.

Endocrine Evaluation

Pediatric endocrine assessment should be strongly considered for children with ONH.

Initial testing may include:

• Morning cortisol
• Glucose
• TSH
• Free T4
• IGF-1
• IGFBP-3
• Electrolytes
• Prolactin

Additional testing depends on:

• Age
• Growth pattern
• Pubertal status
• Symptoms

Diabetes Insipidus Evaluation

If there is:

• Polyuria
• Polydipsia
• Hypernatremia

consider:

• Serum sodium
• Serum osmolality
• Urine osmolality

for possible central diabetes insipidus.

Pubertal Assessment

Monitor for:

• Precocious puberty
• Delayed puberty
• Abnormal growth velocity

Endocrinology may assess:

• LH
• FSH
• Testosterone or estradiol

when appropriate.

Neurologic Evaluation

Consider pediatric neurology referral for:

• Seizures
• Developmental delay
• Abnormal tone
• Major MRI abnormalities
• Suspected cortical visual impairment

Differential Diagnosis

Important differentials include:

• Optic atrophy
• Optic disc coloboma
• Morning glory disc anomaly
• Ocular albinism
• Small physiologic optic disc

ONH vs Optic Atrophy

Optic Nerve Hypoplasia

• Congenitally small disc
• Double-ring sign
• Reduced axon number from development
• Nonprogressive

Optic Atrophy

• Previously normal-sized nerve
• Acquired axonal loss
• Pallor predominates
• Often a history of prior neurologic or ocular injury

Ocular Albinism

May cause:

• Nystagmus
• Reduced visual acuity
• Foveal hypoplasia
• Iris transillumination
• Fundus hypopigmentation

but the optic nerve is not necessarily small.

Optic Disc Coloboma

Typically shows:

• Inferior bowl-shaped excavation
• White glistening base
• Embryonic fissure distribution

rather than uniform disc hypoplasia.

Treatment

There is no treatment capable of regenerating the hypoplastic optic nerve.

Management focuses on:

• Maximizing existing vision
• Treating amblyopia
• Correcting refractive error
• Managing strabismus
• Treating endocrine disease
• Providing developmental and low-vision support

Refractive Correction

Perform cycloplegic refraction and correct:

• Hyperopia
• Myopia
• Astigmatism
• Anisometropia

Amblyopia

Amblyopia may coexist with structural visual impairment.

Treat when appropriate with:

• Optical correction
• Patching
• Atropine penalization

Treatment should be individualized according to residual visual potential.

Strabismus

Management may include:

• Refractive correction
• Amblyopia treatment
• Strabismus surgery

Surgery may be performed for:

• Alignment
• Cosmetic benefit
• Binocular function when possible

Nystagmus

Nystagmus generally reflects impaired early visual input.

Surgery may be considered only in selected cases with:

• Significant abnormal head posture
• Null point
• Associated strabismus

Protective Eyewear

When one eye has much better vision than the other, recommend:

Impact-resistant protective spectacles

to protect the better-seeing eye.

Low-Vision Services

Children with significant bilateral impairment should be referred early for:

• Low-vision rehabilitation
• Educational accommodations
• Early intervention services
• Orientation and mobility training
• Adaptive technology

Endocrine Treatment

Identified deficiencies require prompt treatment.

Examples include:

• Hydrocortisone for adrenal insufficiency
• Levothyroxine for central hypothyroidism
• Growth hormone when appropriate
• Desmopressin for central diabetes insipidus

Critical Safety Issue – ACTH Deficiency

Unrecognized cortisol deficiency can become life-threatening during:

• Infection
• Surgery
• Trauma
• Fasting

Therefore endocrine assessment in ONH is important even when the child appears otherwise well.

Stem Cell Therapy

Stem cell treatments marketed for ONH have not been proven to regenerate the optic nerve or improve visual function.

They are not established therapy.

Follow-Up

Ophthalmic follow-up should monitor:

• Visual acuity
• Refraction
• Amblyopia
• Strabismus
• Nystagmus
• Functional vision

Children may require:

• More frequent review during visual development and amblyopia treatment
• Annual review once stable

Long-Term Endocrine Monitoring

Monitor:

• Height
• Weight
• Growth velocity
• Pubertal development
• Symptoms of adrenal or thyroid dysfunction
• Polyuria/polydipsia

Repeated endocrine assessment may be needed even after an initially normal evaluation.

Prognosis

ONH itself is generally:

Stable and nonprogressive

Visual acuity may appear to improve with age because of:

• Visual maturation
• Better attention
• Improved testing cooperation
• Amblyopia therapy

This does not represent regrowth of the optic nerve.

Prognostic Factors

Visual outcome depends on:

• Severity of axonal hypoplasia
• Unilateral vs bilateral disease
• Amblyopia
• Refractive error
• Associated cerebral visual impairment
• Neurologic abnormalities

Complications

Major complications and associated conditions include:

• Amblyopia
• Strabismus
• Nystagmus
• Severe visual impairment
• Developmental delay
• Growth hormone deficiency
• Central hypothyroidism
• ACTH deficiency
• Diabetes insipidus
• Pubertal abnormalities
• Seizures
• Other CNS malformations

Ophthalmology Pearls

• Optic nerve hypoplasia is a congenital, nonprogressive small optic nerve caused by reduced retinal ganglion cell axons.
• The classic fundus sign is a small pale optic disc with a double-ring sign.
• Bilateral ONH often presents with poor visual behavior and infantile nystagmus; unilateral disease often presents with strabismus.
• Visual acuity ranges from normal to NLP and cannot be accurately predicted from disc appearance.
• Superior segmental ONH (“topless disc”) is classically associated with maternal diabetes and produces an inferior visual field defect.
• The most clinically important systemic association is hypothalamic-pituitary dysfunction.
• Growth hormone deficiency is common, but ACTH/cortisol deficiency is potentially life-threatening and must not be missed.
• Normal MRI does not exclude endocrine dysfunction.
• Endocrine abnormalities can develop later, so longitudinal growth and endocrine surveillance is essential.
• MRI should assess the pituitary, hypothalamus, corpus callosum, and cerebral development.
• ONH must be distinguished from optic atrophy, in which the nerve was previously normal and subsequently lost axons.
• There is no therapy that regenerates the hypoplastic nerve; treatment focuses on refractive correction, amblyopia therapy, strabismus care, endocrine management, and low-vision support.

Ophthalmology – Optic Disc Coloboma

Basics

Description

Optic disc coloboma is a congenital excavation of the optic nerve head caused by abnormal closure of the embryonic fissure.

The classic appearance is:

• Well-demarcated
• White or glistening
• Bowl-shaped excavation
• Usually involving the inferior portion of the optic disc

The defect may be confined to the optic nerve or extend into adjacent:

• Peripapillary retina
• Choroid
• Inferonasal fundus

Associated colobomas may involve the:

• Iris
• Ciliary body
• Choroid
• Retina

Embryology

Optic disc coloboma results from:

Incomplete closure of the proximal embryonic/optic fissure

Because the embryonic fissure lies inferonasally, colobomas characteristically affect the:

• Inferior
• Inferonasal

portion of the optic nerve and fundus.

Laterality

Optic disc coloboma may be:

• Unilateral
• Bilateral

Either pattern can occur.

Bilateral disease should increase suspicion for:

• Genetic syndromes
• Systemic malformations

Visual Acuity

Visual acuity varies widely.

It depends primarily on:

• Integrity of the papillomacular bundle
• Degree of macular involvement
• Associated retinal abnormalities
• Presence of amblyopia
• Development of retinal detachment

Visual acuity may range from:

• Near-normal
• Mildly reduced
• Profoundly impaired

The ophthalmoscopic appearance alone does not reliably predict visual acuity.

Risk Factors and Genetics

Optic disc coloboma may be:

• Sporadic
• Familial

Inheritance can be:

• Autosomal dominant
• Less commonly other patterns depending on syndrome

Important Genetic Associations

Genes and syndromes associated with optic nerve or ocular coloboma include:

• CHD7 – CHARGE syndrome
• PAX2 – renal coloboma syndrome / papillorenal syndrome
• Other developmental genes depending on phenotype

Genetic evaluation is especially appropriate in:

• Bilateral disease
• Family history
• Additional ocular abnormalities
• Systemic congenital anomalies

CHARGE Syndrome

CHARGE is classically associated with:

• Coloboma
• Heart defects
• Atresia of choanae
• Retardation of growth/development
• Genital abnormalities
• Ear abnormalities/hearing loss

It is commonly associated with pathogenic variants in:

CHD7

PAX2 / Renal Coloboma Syndrome

PAX2-related disease may produce:

• Optic nerve dysplasia or coloboma
• Renal hypoplasia
• Renal dysfunction
• Vesicoureteral abnormalities

Therefore, bilateral or atypical optic nerve coloboma may warrant consideration of:

• Renal history
• Blood pressure
• Urinalysis
• Renal function
• Renal imaging when clinically appropriate

Other Syndromic Associations

Optic nerve coloboma may occur with:

• Aicardi syndrome
• Walker-Warburg syndrome
• Goldenhar spectrum
• Focal dermal hypoplasia
• Linear nevus syndromes
• Other craniofacial or neurodevelopmental disorders

Associated Ocular Findings

Possible associated abnormalities include:

• Chorioretinal coloboma
• Iris coloboma
• Ciliary body coloboma
• Microphthalmia
• Strabismus
• Nystagmus
• Amblyopia
• Orbital cyst

Orbital Cyst

A congenital cyst may occasionally occur in association with:

• Optic nerve coloboma
• Microphthalmia
• Chorioretinal coloboma

It may communicate with the globe through the colobomatous defect.

Large cysts may cause:

• Orbital mass effect
• Proptosis
• Cosmetic asymmetry

Pathophysiology

The structural defect produces a congenital excavation at the junction between:

• Posterior globe
• Optic nerve

The excavation may contain:

• Dysplastic tissue
• Glial tissue
• Abnormal scleral architecture

These structural abnormalities may predispose to later retinal complications.

Diagnosis

Diagnosis is usually clinical based on characteristic optic disc morphology.

Important objectives are to determine:

• Visual function
• Extent of coloboma
• Macular involvement
• Presence of associated chorioretinal coloboma
• Presence of retinal detachment
• Associated systemic abnormalities

History

Ask about:

• Poor vision since childhood
• Strabismus
• Nystagmus
• Family history of coloboma
• Congenital abnormalities
• Developmental delay
• Hearing loss
• Cardiac abnormalities
• Renal disease
• Previous retinal detachment symptoms

Symptoms of Retinal Detachment

Patients and families should be educated about:

• Sudden increase in floaters
• Flashes of light
• Curtain or shadow in vision
• Sudden visual decline

These require urgent retinal examination.

Physical Examination

Perform a complete examination including:

• Visual acuity
• Cycloplegic refraction in children
• Pupils
• Ocular alignment
• Motility
• Anterior segment
• Dilated fundus examination

Optic Disc Appearance

Typical findings include:

• Enlarged optic nerve head
• Inferior excavation
• White or glistening base
• Sharply demarcated borders
• Relative preservation of the superior disc

More extensive disease may involve:

• Entire optic disc
• Adjacent inferior retina and choroid

Papillomacular Bundle

Visual prognosis is especially dependent on preservation of the:

Papillomacular bundle

If central axons are spared, useful central vision may remain despite a dramatic-appearing disc anomaly.

Chorioretinal Coloboma

When the defect extends into retina and choroid, typical findings include:

• Inferonasal white excavation
• Absent or thinned retina
• Exposed sclera
• Pigmented borders

These eyes have an important risk of:

Rhegmatogenous retinal detachment

from retinal breaks at or near the coloboma margin.

Retinal Detachment in Isolated Optic Disc Coloboma

Isolated optic disc coloboma may also develop:

Serous retinal detachment

particularly involving the macula.

Fluid may gain access through abnormal communications involving:

• Optic disc excavation
• Peripapillary retina

This mechanism differs from the typical rhegmatogenous detachment associated with large chorioretinal colobomas.

Amblyopia

Reduced vision in childhood may result from:

• Structural optic nerve abnormality
• Anisometropia
• Strabismus

Treatable amblyopia should not be overlooked simply because a congenital optic nerve anomaly is present.

Strabismus

Strabismus may occur because of:

• Asymmetric visual acuity
• Sensory deprivation

Management depends on:

• Visual potential
• Alignment
• Cosmetic and functional concerns

Diagnostic Testing

Optical Coherence Tomography

OCT is very useful for defining:

• Optic nerve excavation
• Peripapillary retinal structure
• Macular involvement
• Subretinal or intraretinal fluid
• Serous retinal detachment

Enhanced-depth imaging may further delineate deep disc architecture.

Fundus Photography

Baseline photography is useful for documenting:

• Disc appearance
• Extent of coloboma
• Associated retinal abnormalities
• Future change

Wide-Field Imaging

Wide-field imaging can help identify:

• Peripheral chorioretinal coloboma
• Retinal breaks
• Retinal detachment
• Pigmented borders

B-Scan Ultrasonography

B-scan may be useful when there is:

• Poor fundus view
• Suspected retinal detachment
• Orbital cyst
• Microphthalmia

Neuroimaging

MRI is not routinely required for every isolated typical optic disc coloboma.

Consider MRI when there are:

• Neurologic abnormalities
• Unusual disc appearance
• Suspected orbital cyst
• Brain malformations
• Syndromic features

Systemic Evaluation

A systemic examination is especially important in children.

Assess for:

• Craniofacial anomalies
• Ear abnormalities
• Hearing loss
• Cardiac disease
• Renal abnormalities
• Developmental delay
• Neurologic findings

Laboratory Testing

There is no routine laboratory test for isolated optic disc coloboma.

Testing should be directed toward suspected syndromic or systemic disease.

Differential Diagnosis

The major congenital excavated optic disc anomalies include:

• Morning glory disc anomaly
• Peripapillary staphyloma
• Optic disc pit
• Severe glaucomatous cupping in selected cases

Morning Glory Disc Anomaly

Morning glory disc typically demonstrates:

• Funnel-shaped excavation
• Enlarged dysplastic disc
• Central glial tuft
• Radially oriented retinal vessels
• Peripapillary pigmentary ring

It is often associated with:

• Moyamoya disease
• Carotid abnormalities
• Basal encephalocele
• Pituitary abnormalities

These systemic associations differ significantly from those of typical optic disc coloboma.

Optic Disc Coloboma vs Morning Glory

Optic Disc Coloboma

• Inferior excavation
• Embryonic fissure defect
• Superior disc often preserved
• May coexist with inferonasal chorioretinal coloboma

Morning Glory Disc

• Funnel-shaped whole-disc excavation
• Central glial tuft
• Radial vessels
• Pigmented peripapillary ring

Peripapillary Staphyloma

Peripapillary staphyloma consists of:

• Deep excavation surrounding the optic nerve

with a relatively:

Normal-appearing optic disc within the excavation

Unlike morning glory:

• No central glial tuft
• No characteristic radial vessels

Optic Disc Pit

Optic disc pits are usually:

• Smaller
• Gray-white depressions
• Often temporal
• Associated with serous macular detachment

They are generally much smaller than a true optic disc coloboma.

Treatment

There is no medical therapy that corrects the congenital structural defect.

Management focuses on:

• Maximizing visual potential
• Treating amblyopia
• Correcting refractive error
• Monitoring for retinal detachment
• Treating associated strabismus
• Managing retinal complications

Refractive Correction

Children should receive accurate cycloplegic refraction.

Correct:

• Hyperopia
• Myopia
• Astigmatism
• Anisometropia

to maximize visual development.

Amblyopia Therapy

If amblyopia is present and useful visual potential remains, treatment may include:

• Optical correction
• Patching
• Atropine penalization when appropriate

Structural disease does not automatically eliminate the potential benefit of amblyopia treatment.

Strabismus Surgery

Strabismus surgery may be considered for:

• Significant misalignment
• Abnormal head posture
• Cosmetic concerns
• Functional binocular goals where possible

Retinal Detachment Treatment

Retinal detachment requires retina specialist management.

Depending on mechanism, treatment may include:

• Vitrectomy
• Laser photocoagulation
• Scleral buckle
• Internal tamponade
• Combination surgery

Serous Macular Detachment

Serous detachment associated with the optic disc excavation can be challenging.

Treatment may involve:

• Vitrectomy
• Peripapillary laser in selected cases
• Gas tamponade
• Other individualized retinal surgical techniques

There is no single universally successful strategy.

Prophylactic Laser

Routine prophylactic laser around an asymptomatic optic disc coloboma is not universally recommended.

In associated chorioretinal coloboma, prophylactic laser to the coloboma margin has been considered in selected high-risk eyes, but evidence and practice vary.

Management should be individualized by a retina specialist.

Eye Protection

If one eye has significantly reduced vision, recommend:

Protective impact-resistant eyewear

to protect the better-seeing eye.

This is particularly important for children and monocular patients.

Low-Vision Rehabilitation

Patients with bilateral significant visual impairment may benefit from:

• Low-vision services
• Magnification
• Electronic visual aids
• Educational accommodations
• Orientation and mobility support

Genetic Counseling

Consider genetic counseling when:

• Bilateral disease is present
• A syndrome is suspected
• There is a family history
• Parents are planning future pregnancies

Molecular testing may be useful when a specific syndrome or gene is suspected.

Follow-Up

Regular ophthalmic follow-up should monitor:

• Visual acuity
• Refraction
• Amblyopia
• Strabismus
• Macula
• Peripheral retina
• Retinal detachment

Frequency depends on:

• Age
• Extent of coloboma
• Associated retinal findings
• Previous retinal complications

Prognosis

Visual prognosis is highly variable.

It depends primarily on:

• Papillomacular bundle involvement
• Macular involvement
• Associated chorioretinal disease
• Amblyopia
• Retinal detachment

Some eyes maintain good vision despite a striking disc anomaly.

Others have profound congenital visual impairment.

Retinal Detachment Risk

A major long-term concern is:

Acquired retinal detachment

This may occur years after the congenital anomaly is diagnosed.

Therefore, patients require long-term surveillance.

Complications

Important complications include:

• Retinal detachment
• Serous macular detachment
• Rhegmatogenous retinal detachment with associated chorioretinal coloboma
• Amblyopia
• Strabismus
• Progressive visual loss from retinal complications

Ophthalmology Pearls

• Optic disc coloboma is a congenital inferonasal/inferior excavation caused by incomplete closure of the embryonic fissure.
• The classic lesion is a white, bowl-shaped excavation involving the inferior optic disc.
• Visual acuity depends more on papillomacular bundle and macular involvement than on the dramatic appearance of the disc.
• Optic disc coloboma may be isolated or associated with iris, ciliary body, and chorioretinal colobomas.
• CHD7/CHARGE syndrome and PAX2-related renal coloboma syndrome are important genetic associations.
• Bilateral disease or systemic congenital abnormalities should prompt genetic and systemic evaluation.
• Amblyopia remains treatable and should not be overlooked because a structural optic nerve defect is present.
• The major long-term ocular complication is retinal detachment.
• Isolated optic disc coloboma may produce serous retinal detachment, whereas associated chorioretinal coloboma more commonly predisposes to rhegmatogenous detachment.
• Differentiate optic disc coloboma from morning glory disc anomaly, which has a central glial tuft, radial vessels, and important cerebrovascular associations.
• Peripapillary staphyloma contains a relatively normal disc within a deep peripapillary excavation.
• Regular lifelong retinal surveillance and protective eyewear for patients with asymmetric vision are important.

Ophthalmology – Open-Angle Glaucomas

Basics

Description

Open-angle glaucoma (OAG) refers to a group of chronic progressive optic neuropathies characterized by:

• Loss of retinal ganglion cells and their axons
• Characteristic optic nerve head cupping
• Retinal nerve fiber layer loss
• Corresponding visual field defects
• An anatomically open anterior chamber angle on gonioscopy

Intraocular pressure (IOP) is the most important modifiable risk factor, but glaucomatous damage can occur at either:

• Elevated IOP
• Statistically normal IOP

Classification

Open-angle glaucoma is broadly divided into:

Primary Open-Angle Glaucoma

Glaucomatous optic neuropathy with an open angle and no identifiable secondary ocular cause.

Includes:

• High-pressure primary open-angle glaucoma
• Normal-tension glaucoma

Secondary Open-Angle Glaucoma

Open-angle glaucoma caused by another ocular or systemic process.

Important examples include:

• Pseudoexfoliative glaucoma
• Pigmentary glaucoma
• Steroid-induced glaucoma
• Uveitic glaucoma
• Traumatic/angle-recession glaucoma
• Lens-related glaucoma
• Glaucoma following ocular surgery
• Elevated episcleral venous pressure
• Certain metabolic or infiltrative disorders

Ocular Hypertension

Ocular hypertension is different from glaucoma.

It consists of:

• Elevated IOP
• Open angles
• No glaucomatous optic nerve damage
• No corresponding visual field loss

It is a risk state for future glaucoma rather than established optic neuropathy.

Epidemiology

Glaucoma is one of the leading causes of irreversible blindness worldwide.

Primary open-angle glaucoma becomes increasingly common with:

• Increasing age
• Family history
• African ancestry
• Certain genetic backgrounds

A large proportion of affected individuals remain undiagnosed because early disease is usually asymptomatic.

Risk Factors

Important risk factors for developing or progressing open-angle glaucoma include:

• Elevated IOP
• Increasing age
• Family history of glaucoma
• African ancestry
• Thin central corneal thickness
• Myopia
• Large vertical cup-to-disc ratio
• Disc hemorrhage
• Lower ocular perfusion pressure
• Greater baseline structural or visual field damage

Possible systemic associations include:

• Migraine
• Vascular dysregulation
• Sleep apnea
• Systemic hypotension

These associations are particularly discussed in normal-tension glaucoma.

Genetics

Primary open-angle glaucoma is genetically heterogeneous.

Genes associated with selected forms include:

• MYOC
• OPTN
• TBK1
• Multiple polygenic risk loci

Most adult POAG is multifactorial rather than attributable to a single gene mutation.

Genetic testing is not routinely required in typical adult-onset disease.

Pathophysiology

The final common pathway is:

Retinal ganglion cell death → axonal loss → optic nerve cupping → visual field loss

Major mechanisms include:

• Mechanical stress at the lamina cribrosa
• Impaired axoplasmic transport
• Ischemia and vascular dysregulation
• Mitochondrial dysfunction
• Oxidative stress
• Neuroinflammation

Role of Intraocular Pressure

IOP is the most important treatable risk factor.

Damage may occur because of:

• Absolute pressure elevation
• Pressure fluctuations
• Individual susceptibility of the optic nerve

A “normal” IOP does not guarantee protection from glaucoma.

Conversely, some patients tolerate elevated IOP for years without developing damage.

Aqueous Humor Dynamics

IOP depends on the balance between:

• Aqueous humor production by the ciliary body
• Trabecular outflow
• Uveoscleral outflow
• Episcleral venous pressure

Most OAG therapies work by:

• Decreasing aqueous production
• Increasing trabecular outflow
• Increasing uveoscleral outflow

Diagnosis

Diagnosis requires integration of:

• IOP
• Gonioscopy
• Optic nerve appearance
• OCT
• Visual field testing
• Central corneal thickness
• Longitudinal change

The diagnosis should not be based on IOP alone.

History

Ask about:

• Family history of glaucoma
• Previous elevated IOP
• Steroid exposure
• Ocular trauma
• Uveitis
• Previous ocular surgery
• Migraine
• Sleep apnea
• Systemic hypotension
• Vascular disease
• Medication adherence
• Previous laser or glaucoma surgery

Symptoms

Early POAG is typically:

Asymptomatic

Central visual acuity usually remains good until advanced disease.

Late symptoms may include:

• Peripheral field loss
• Difficulty with contrast
• Trouble navigating in dim light
• Reading difficulty from paracentral loss
• Advanced tunnel vision

Visual Acuity

Visual acuity may remain normal until late disease.

Reduced central vision early in the course should raise concern for:

• Macular disease
• Optic neuropathy
• Advanced central glaucomatous damage
• Another diagnosis

Pupillary Examination

A relative afferent pupillary defect may occur when glaucoma is:

• Markedly asymmetric
• Advanced in one eye

Gonioscopy

Gonioscopy is mandatory in the evaluation of glaucoma.

Open-angle glaucoma requires visualization of the trabecular meshwork.

Gonioscopy also helps detect secondary causes such as:

• Pigment deposition
• Pseudoexfoliation
• Angle recession
• Neovascularization
• Peripheral anterior synechiae
• Inflammatory debris

Central Corneal Thickness

Pachymetry should be obtained because CCT influences:

• IOP interpretation
• Risk stratification

Thin corneas may underestimate IOP and are associated with greater glaucoma risk.

There is no universally accepted formula to “correct” IOP numerically for CCT.

Optic Nerve Examination

A dilated stereoscopic optic nerve examination should evaluate:

• Cup-to-disc ratio
• Vertical cupping
• Neuroretinal rim thickness
• Focal notching
• Inter-eye asymmetry
• Disc hemorrhage
• Pallor
• RNFL defects

Characteristic Glaucomatous Optic Nerve Findings

Typical findings include:

• Progressive cup enlargement
• Inferotemporal rim thinning
• Superotemporal rim thinning
• Vertical elongation of the cup
• Focal rim notch
• Laminar dot sign
• Acquired optic nerve pit
• Corresponding RNFL wedge defect

ISNT Rule

In many normal optic nerves, rim thickness follows approximately:

Inferior > Superior > Nasal > Temporal

Violation of this pattern can raise suspicion for glaucoma.

However, the ISNT rule is not sufficiently specific to diagnose glaucoma by itself.

Disc Hemorrhage

A splinter or flame-shaped hemorrhage at the disc margin is an important sign.

It is associated with:

• Higher risk of progression
• Localized RNFL loss
• Normal-tension glaucoma in particular

A new disc hemorrhage should prompt reassessment of:

• Target IOP
• Adherence
• Progression rate

Optic Disc Pallor

Glaucoma usually produces:

Cupping greater than pallor

If optic disc pallor is excessive relative to cupping, consider:

• Ischemic optic neuropathy
• Compressive optic neuropathy
• Toxic/nutritional optic neuropathy
• Hereditary optic neuropathy
• Prior optic neuritis

Optical Coherence Tomography

OCT is central to modern glaucoma diagnosis and follow-up.

It evaluates:

• Peripapillary RNFL
• Macular ganglion cell complex
• Ganglion cell–inner plexiform layer
• Optic nerve head

Structural Progression

Serial OCT can detect:

• Progressive RNFL thinning
• Ganglion cell loss
• Focal structural change

Structural progression may precede detectable visual field loss.

Preperimetric Glaucoma

Some patients have clear structural glaucomatous damage with:

• Normal standard automated perimetry

This is called:

Preperimetric glaucoma

Thus, a normal visual field does not exclude early glaucoma.

Visual Field Testing

Standard automated perimetry is used to detect functional damage.

Typical glaucomatous defects include:

• Paracentral scotoma
• Nasal step
• Arcuate scotoma
• Seidel scotoma
• Temporal wedge
• Advanced generalized constriction

Structure-Function Correlation

Glaucomatous field defects should correspond anatomically to optic nerve and RNFL damage.

For example:

• Superior RNFL loss → inferior visual field defect
• Inferior RNFL loss → superior visual field defect

Poor correlation should raise suspicion for another optic neuropathy.

Central Visual Field Testing

A 10-2 field is useful when there is:

• Paracentral damage
• Fixation-threatening disease
• Advanced glaucoma

A 24-2C strategy may also improve central sampling.

Optic Disc Photography

Baseline and serial optic disc photographs remain valuable because they can document:

• Progressive rim loss
• Disc hemorrhage
• Cup enlargement
• RNFL changes

They complement OCT rather than being replaced by it.

IOP Measurement

Goldmann applanation tonometry remains the clinical reference standard.

Important considerations include:

• Time of day
• CCT
• Corneal biomechanics
• Measurement technique
• IOP fluctuation

Repeated measurements may be useful in selected patients.

Diurnal IOP Variation

Some patients have clinically important pressure peaks outside routine office hours.

Consider repeated measurements when:

• Progression occurs despite apparently low office IOP
• IOP variability is suspected
• Normal-tension glaucoma is being evaluated

Differential Diagnosis

Open-angle glaucoma is a diagnosis of exclusion.

Important mimics include:

• Physiologic large cupping
• High myopia
• Congenital optic disc anomalies
• Optic nerve coloboma
• Tilted disc
• Optic nerve pits
• Dominant optic atrophy
• Ischemic optic neuropathy
• Compressive optic neuropathy
• Toxic/nutritional optic neuropathy
• Optic neuritis
• Prior papilledema

Neuroimaging Red Flags

Consider neuroimaging when there is:

• Pallor greater than cupping
• Marked visual acuity loss
• Central scotoma inconsistent with glaucoma
• Color vision loss out of proportion
• Rapid progression
• Severe unilateral disease
• Hemianopic visual field defect
• Neurologic symptoms

Treatment Principles

The established treatment goal is:

Lower IOP sufficiently to slow progression and preserve useful lifetime vision.

The target IOP is individualized according to:

• Baseline IOP
• Disease severity
• Rate of progression
• Age
• Life expectancy
• Central visual field involvement
• Fellow-eye status

Target IOP

There is no single safe IOP for every patient.

A commonly used initial framework is:

Mild glaucoma

Approximately 20–30% reduction from baseline

Moderate glaucoma

Often 30% or more

Advanced glaucoma

May require very low target pressures

Targets should be revised according to actual progression.

First-Line Treatment Options

Modern initial treatment commonly includes:

• Selective laser trabeculoplasty
• Prostaglandin analog
• Sometimes both

Choice depends on:

• Disease severity
• Patient preference
• Adherence
• Cost
• Ocular surface disease
• Expected treatment burden

Selective Laser Trabeculoplasty

SLT lowers IOP by improving trabecular outflow.

Advantages include:

• Effective IOP reduction
• No daily medication adherence
• Minimal systemic effects
• Can be repeated in selected patients

SLT is now widely accepted as:

A first-line treatment option for primary open-angle glaucoma and ocular hypertension

rather than merely an adjunct after medications fail.

Prostaglandin Analogs

Examples include:

• Latanoprost
• Travoprost
• Bimatoprost
• Tafluprost
• Latanoprostene bunod

They primarily increase uveoscleral and/or trabecular outflow.

Advantages:

• Strong IOP lowering
• Once-daily dosing
• Minimal systemic effects

Prostaglandin Adverse Effects

Possible adverse effects include:

• Conjunctival hyperemia
• Eyelash growth
• Periocular skin pigmentation
• Iris darkening
• Prostaglandin-associated periorbitopathy

Beta-Blockers

Examples:

• Timolol
• Betaxolol

They lower IOP by reducing aqueous production.

Use cautiously in:

• Asthma
• COPD
• Bradycardia
• Heart block
• Symptomatic hypotension

Alpha-2 Agonists

Example:

• Brimonidine

Mechanisms include:

• Reduced aqueous production
• Increased uveoscleral outflow

Adverse effects include:

• Follicular allergy
• Dry mouth
• Fatigue
• Somnolence

Topical Carbonic Anhydrase Inhibitors

Examples:

• Dorzolamide
• Brinzolamide

They reduce aqueous production.

Often used as:

• Adjunctive therapy
• Combination therapy

Rho Kinase Inhibitors

Examples include:

• Netarsudil

They primarily improve trabecular outflow and may also reduce episcleral venous pressure.

Adverse effects include:

• Conjunctival hyperemia
• Corneal verticillata
• Subconjunctival hemorrhage

Cholinergic Agents

Pilocarpine increases trabecular outflow by contracting the ciliary muscle.

It is used far less often in chronic OAG because of:

• Brow ache
• Miosis
• Induced myopia
• Reduced night vision
• Retinal detachment concern in susceptible patients

Oral Carbonic Anhydrase Inhibitors

Examples:

• Acetazolamide
• Methazolamide

These may be used temporarily when rapid IOP reduction is required.

They are generally unsuitable for routine long-term therapy because of systemic adverse effects.

Medication Adherence

Adherence is a major determinant of treatment success.

Barriers include:

• Cost
• Complex regimens
• Ocular surface irritation
• Forgetfulness
• Poor understanding
• Difficulty instilling drops

Simplifying therapy can improve adherence.

Laser Trabeculoplasty

SLT has largely replaced argon laser trabeculoplasty in routine practice because it:

• Uses lower energy
• Causes less thermal damage
• Can be repeated more readily

Cataract Surgery

Phacoemulsification alone may modestly reduce IOP in some patients with open-angle glaucoma.

It is not usually sufficient treatment for advanced disease.

Minimally Invasive Glaucoma Surgery

MIGS procedures are increasingly used for:

• Mild to moderate glaucoma
• Reducing medication burden
• Combination with cataract surgery

Examples include:

• Trabecular micro-bypass stents
• Goniotomy
• Trabeculotomy
• Canal-based procedures

Limitations of MIGS

MIGS generally provides:

• Modest to moderate IOP reduction
• Lower complication rates than trabeculectomy

However, many MIGS procedures cannot reliably achieve the very low pressures required for:

• Advanced glaucoma
• Rapid progression
• Severe fixation-threatening disease

Trabeculectomy

Trabeculectomy remains one of the most effective methods for achieving:

Very low IOP

It is especially useful for:

• Advanced glaucoma
• Rapid progression
• Failure of medical/laser therapy

Trabeculectomy Complications

Potential complications include:

• Hypotony
• Shallow anterior chamber
• Choroidal effusion
• Blebitis
• Endophthalmitis
• Cataract progression
• Bleb failure

Glaucoma Drainage Devices

Tube shunts include:

• Ahmed
• Baerveldt
• Other drainage implants

They are particularly useful when:

• Trabeculectomy has failed
• Conjunctival scarring is present
• Secondary glaucoma exists
• Prior ocular surgery complicates filtration surgery

Cyclophotocoagulation

Cyclodestructive procedures reduce aqueous production by treating the ciliary body.

Modern approaches include:

• Transscleral cyclophotocoagulation
• Micropulse cyclophotocoagulation
• Endoscopic cyclophotocoagulation

They are increasingly used beyond blind painful eyes, but patient selection remains important.

Major Evidence From Clinical Trials

Several major studies established that lowering IOP reduces glaucoma risk and progression.

OHTS

The Ocular Hypertension Treatment Study showed that treating ocular hypertension reduced conversion to POAG.

At about 5 years:

• Untreated: ~9.5% developed glaucoma
• Treated: ~4.4%

Collaborative Normal-Tension Glaucoma Study

Approximately:

30% IOP reduction

significantly reduced progression in normal-tension glaucoma.

Early Manifest Glaucoma Trial

The EMGT demonstrated that:

Each additional mmHg of IOP reduction lowers the risk of progression

and confirmed the importance of pressure reduction even in relatively early glaucoma.

LiGHT Trial

The LiGHT trial supported:

SLT as an effective first-line treatment

for many patients with newly diagnosed open-angle glaucoma or ocular hypertension.

Many patients were able to remain drop-free for substantial periods.

Neuroprotection

Glaucoma is a neurodegenerative disease, and many direct neuroprotective strategies have been studied.

However:

No medication has yet been definitively proven to provide clinically meaningful neuroprotection independent of IOP lowering.

IOP reduction remains the only established treatment proven to slow progression.

Follow-Up

Follow-up frequency depends on:

• Disease severity
• Target IOP
• Progression rate
• Treatment changes
• Adherence

Mild Stable Disease

May often be monitored every:

4–6 months

with periodic:

• OCT
• Visual field testing
• Disc examination

Moderate or Advanced Disease

Often requires closer follow-up:

Every 2–4 months

depending on stability.

After Treatment Changes

Patients should be reassessed after:

• Starting new medication
• SLT
• Incisional surgery
• Significant IOP change

to confirm:

• Efficacy
• Safety
• Adherence

Rate of Progression

The key question in long-term management is:

How fast is the patient losing retinal ganglion cells and visual field?

Management should be intensified when progression threatens useful lifetime vision.

Patient Education

Patients should understand that:

• Glaucoma is usually asymptomatic until late.
• Vision already lost cannot currently be restored.
• Treatment aims to prevent further damage.
• Adherence and follow-up are essential.
• “Normal” IOP does not necessarily mean glaucoma is controlled.

Prognosis

Prognosis depends on:

• Disease severity at diagnosis
• Age
• Life expectancy
• Baseline IOP
• Rate of progression
• Central field involvement
• Treatment adherence
• Ability to achieve target IOP

Early diagnosis and appropriate treatment greatly reduce the risk of severe visual loss.

Complications

Uncontrolled open-angle glaucoma can lead to:

• Progressive RNFL loss
• Progressive visual field loss
• Paracentral scotoma
• Severe peripheral field constriction
• Loss of fixation
• Permanent visual impairment
• Blindness

Treatment complications may include:

• Ocular surface disease
• Medication intolerance
• Laser-related IOP spikes
• Hypotony
• Infection
• Surgical failure

Ophthalmology Pearls

• Open-angle glaucoma = characteristic glaucomatous optic neuropathy with an open angle on gonioscopy.
• IOP is the most important modifiable risk factor, but glaucoma can occur at statistically normal pressures.
• Diagnosis is based on optic nerve/RNFL damage and corresponding functional loss, not IOP alone.
• Gonioscopy is essential to distinguish open-angle from angle-closure and secondary mechanisms.
• Typical optic nerve findings include vertical cupping, focal rim notching, RNFL loss, and disc hemorrhage.
• Disc pallor greater than cupping suggests a nonglaucomatous optic neuropathy.
• OCT may detect structural loss before standard visual fields become abnormal—preperimetric glaucoma.
• Glaucomatous visual field defects should anatomically correspond to RNFL and disc damage.
• SLT and prostaglandin analogs are both appropriate first-line treatments in many patients.
• MIGS is useful mainly for mild to moderate disease and medication reduction; it may not achieve sufficiently low IOP for advanced glaucoma.
• Trabeculectomy remains one of the most effective procedures when a very low target IOP is required.
• Major trials consistently show that lowering IOP reduces the risk of glaucoma development and progression.
• No independent neuroprotective therapy has yet replaced IOP lowering as the evidence-based foundation of glaucoma treatment.

Ophthalmology – Ocular Syphilis

Basics

Description

Ocular syphilis is ocular involvement by the spirochete Treponema pallidum.

Syphilis is a chronic systemic infection capable of affecting essentially any ocular structure and is known as the:

“Great masquerader”

because it can mimic many inflammatory, infectious, vascular, and neoplastic eye diseases.

Ocular involvement may occur during any stage of syphilis and may present as:

• Anterior uveitis
• Intermediate uveitis
• Posterior uveitis
• Panuveitis
• Retinitis
• Retinal vasculitis
• Chorioretinitis
• Optic neuropathy
• Interstitial keratitis

A key management principle is:

Ocular syphilis should be treated with a neurosyphilis regimen, even when cerebrospinal fluid findings are normal.

Etiology

The causative organism is:

Treponema pallidum

a motile spirochete.

Transmission

Acquired Syphilis

Transmission occurs primarily through direct contact with infectious lesions during:

• Vaginal intercourse
• Anal intercourse
• Oral sex

Congenital Syphilis

Transmission occurs:

Transplacentally from an infected mother to the fetus

Maternal screening and treatment during pregnancy are essential for prevention.

Epidemiology

Ocular syphilis accounts for a small but important proportion of uveitis.

Its frequency varies according to:

• Geographic region
• Syphilis prevalence
• HIV prevalence
• Population studied

Ocular disease may occur in both:

• HIV-negative patients
• People living with HIV

Risk Factors

Important risk factors include:

• Unprotected sexual exposure
• Multiple sexual partners
• Men who have sex with men
• HIV infection
• Other sexually transmitted infections
• Intravenous drug use
• Previous syphilis infection or inadequately treated infection

Systemic Stages of Acquired Syphilis

Primary Syphilis

Classically presents with:

Painless chancre

at the inoculation site.

Regional lymphadenopathy may occur.

Secondary Syphilis

May produce:

• Diffuse maculopapular rash
• Palmar and plantar lesions
• Generalized lymphadenopathy
• Fever
• Malaise
• Condylomata lata

Ocular manifestations are particularly important during secondary disease but can occur at any stage.

Latent Syphilis

Serologic evidence of infection without active clinical manifestations.

It is classified as:

• Early latent
• Late latent
• Unknown duration

Tertiary Syphilis

Potential manifestations include:

• Cardiovascular syphilis
• Gummatous disease
• Neurologic disease

Neurologic and ocular involvement can actually occur much earlier and should not be regarded as exclusively “tertiary.”

Congenital Syphilis

Early Manifestations

May include:

• Hepatosplenomegaly
• Mucocutaneous lesions
• Rhinitis
• Bone abnormalities
• Chorioretinitis

Late Manifestations

Classical findings include:

• Frontal bossing
• Saddle nose
• Saber shins
• Hutchinson teeth
• Sensorineural hearing loss
• Interstitial keratitis

The classic Hutchinson triad consists of:

• Interstitial keratitis
• Hutchinson teeth
• Sensorineural deafness

Pathophysiology

Ocular injury results from:

• Direct spirochetal infection
• Host inflammatory response
• Immune-mediated tissue injury
• Vascular inflammation

This can affect both the anterior and posterior segments.

Clinical Presentation

Patients may report:

• Blurred vision
• Floaters
• Photophobia
• Ocular pain
• Redness
• Scotoma
• Metamorphopsia
• Reduced color vision
• Sudden or progressive visual loss

Disease may be:

• Unilateral
• Bilateral
• Asymmetric

Important Clinical Principle

Syphilis can imitate almost any form of uveitis.

Therefore:

Syphilis testing should be considered in essentially all unexplained uveitis, particularly posterior or panuveitis.

Anterior Segment Manifestations

Possible findings include:

• Granulomatous anterior uveitis
• Non-granulomatous anterior uveitis
• Keratic precipitates
• Iris nodules
• Posterior synechiae
• Elevated IOP
• Scleritis
• Episcleritis

Interstitial Keratitis

Classically associated with congenital syphilis.

Features may include:

• Stromal corneal inflammation
• Corneal vascularization
• Photophobia
• Reduced vision

After inflammation resolves, residual:

Ghost vessels

may remain in the corneal stroma.

Vitreous Involvement

Syphilitic posterior disease commonly produces:

• Vitritis
• Haze
• Inflammatory cells

The amount of vitritis may vary considerably.

Posterior Segment Manifestations

Syphilis may produce:

• Retinitis
• Chorioretinitis
• Retinal vasculitis
• Retinal vascular occlusion
• Neuroretinitis
• Optic neuritis
• Optic disc edema
• Exudative retinal detachment
• Placoid chorioretinitis

Acute Syphilitic Posterior Placoid Chorioretinitis

A particularly characteristic manifestation is:

Acute syphilitic posterior placoid chorioretinitis (ASPPC)

Typical appearance:

• Large
• Yellow-gray
• Placoid lesion
• At or near the macula
• Often involving the outer retina and RPE

ASPPC should strongly raise suspicion for syphilis.

OCT Findings in ASPPC

OCT may show:

• Disruption of the ellipsoid zone
• Outer retinal abnormalities
• RPE irregularity
• Hyperreflective material at the RPE/photoreceptor interface
• Later restoration with successful treatment

Fluorescein Angiography

FA may demonstrate:

• Early hypofluorescence
• Late staining
• Retinal vascular leakage
• Optic disc leakage
• Vasculitis

Indocyanine Green Angiography

ICG may demonstrate areas of:

• Choroidal hypofluorescence
• Choriocapillaris involvement

in selected posterior cases.

Fundus Autofluorescence

May help demonstrate:

• RPE disturbance
• Extent of placoid lesions
• Evolution with treatment

Retinal Vasculitis

Syphilitic vasculitis may involve:

• Arteries
• Veins
• Both

It can lead to:

• Vascular occlusion
• Retinal ischemia
• Neovascular complications

Optic Nerve Manifestations

Possible manifestations include:

• Optic neuritis
• Optic perineuritis
• Neuroretinitis
• Papillitis
• Optic disc edema
• Optic atrophy

MRI may be useful when optic nerve or central neurologic involvement is suspected.

Pupillary Findings

The classic Argyll Robertson pupil:

• Accommodates to near
• Reacts poorly or not at all to light

It is historically associated with neurosyphilis but is uncommon in modern practice.

Cranial Neuropathies

Neurosyphilis may produce:

• Oculomotor nerve palsy
• Trochlear nerve palsy
• Abducens nerve palsy
• Other neurologic deficits

Diagnosis

Diagnosis combines:

• Compatible ocular findings
• Syphilis serology
• Exclusion of important mimics

No single ocular appearance confirms syphilis.

Serologic Testing

Testing generally includes both:

1. Nontreponemal test
2. Treponemal test

Nontreponemal Tests

Examples:

• RPR
• VDRL

These provide a quantitative titer and are useful for monitoring treatment response.

Nontreponemal Titers

A clinically meaningful change is generally:

Fourfold change in titer

For example:

• 1:32 → 1:8 = fourfold decline
• 1:8 → 1:32 = fourfold rise

Titers are therefore useful for:

• Monitoring therapy
• Detecting reinfection
• Detecting treatment failure

False-Positive Nontreponemal Tests

False-positive results may occur with:

• Autoimmune disease
• Pregnancy
• Infection
• Older age
• Other inflammatory states

Therefore, reactive nontreponemal testing requires confirmation with a treponemal assay.

Prozone Phenomenon

Very high antibody concentrations may rarely cause a falsely negative nontreponemal test.

If clinical suspicion is strong despite a negative RPR/VDRL, the laboratory can repeat testing using:

Serial dilution

to exclude a prozone effect.

Treponemal Tests

Examples include:

• TP-PA
• FTA-ABS
• Treponemal enzyme immunoassays
• Chemiluminescent immunoassays

These usually remain positive indefinitely after infection.

Therefore:

Treponemal tests should not be used to monitor treatment response.

Reverse-Sequence Screening

Many laboratories now begin with a:

Treponemal immunoassay

followed by quantitative RPR or VDRL.

Discordant results may require a second treponemal test such as TP-PA.

HIV Testing

All patients diagnosed with ocular syphilis should be offered:

HIV testing

because coinfection is important for:

• Overall management
• STI counseling
• Follow-up

Other STI screening should also be considered.

Lumbar Puncture

Older recommendations favored lumbar puncture in virtually all ocular syphilis.

Modern practice is more selective.

When CSF Examination Is Indicated

Lumbar puncture is particularly appropriate when there are:

• Cranial nerve abnormalities
• Meningeal symptoms
• Cognitive changes
• Motor or sensory deficits
• Other neurologic manifestations

CSF evaluation typically includes:

• Cell count
• Protein
• CSF-VDRL

Isolated Ocular Syphilis

If a patient has:

• Reactive syphilis serology
• Confirmed ocular abnormalities
• No neurologic findings

CSF examination is not required before treatment.

Most importantly:

Treatment should not be delayed for lumbar puncture.

CSF-VDRL

CSF-VDRL is:

• Highly specific
• Relatively insensitive

Therefore, a positive result strongly supports neurosyphilis, but a negative result does not completely exclude it.

Neuroimaging

MRI brain and/or orbits may be useful when there is:

• Optic neuropathy
• Cranial nerve palsy
• Focal neurologic deficit
• Concern for CNS disease

Differential Diagnosis

Because syphilis is a great masquerader, the differential is broad.

Consider:

• Sarcoidosis
• Tuberculosis
• Toxoplasmosis
• Acute retinal necrosis
• CMV retinitis
• Behçet disease
• VKH
• HLA-B27-associated uveitis
• Intermediate uveitis
• APMPPE
• Other white-dot syndromes
• Lyme disease
• Fungal endophthalmitis
• Toxocariasis
• Primary vitreoretinal lymphoma

Treatment

Critical Principle

All ocular syphilis should be treated using a neurosyphilis regimen.

Do not use standard single-dose benzathine penicillin treatment alone for active ocular syphilis.

First-Line Treatment

The preferred regimen is:

Aqueous crystalline penicillin G

Total:

18–24 million units/day IV

administered as:

• 3–4 million units IV every 4 hours

or

• Continuous infusion

for:

10–14 days

Alternative Penicillin Regimen

If reliable adherence can be ensured:

• Procaine penicillin G 2.4 million units IM once daily
• Plus probenecid 500 mg orally four times daily

for:

10–14 days

Additional Benzathine Penicillin

Because neurosyphilis regimens are shorter than those used for late latent syphilis, clinicians may consider:

Benzathine penicillin G 2.4 million units IM weekly for 1–3 weeks

after completion of neurosyphilis therapy in selected patients, particularly when the underlying stage would otherwise require a longer course.

Penicillin Allergy

For nonpregnant patients with penicillin allergy, an alternative that may be considered is:

Ceftriaxone 1–2 g IM or IV daily for 10–14 days

However, evidence is less extensive than for penicillin.

If there is concern about ceftriaxone safety or reliability of alternative therapy:

• Penicillin allergy testing
• Desensitization

should be considered.

Pregnancy

Pregnant patients with syphilis should receive:

Penicillin

because penicillin is the only proven treatment that reliably treats maternal infection and prevents fetal syphilis.

Patients with true penicillin allergy should undergo:

Desensitization followed by penicillin therapy

HIV Coinfection

People with HIV and ocular syphilis are treated with the:

Same neurosyphilis regimen

as patients without HIV.

HIV status does not justify using a less intensive regimen.

Adjunctive Corticosteroids

Corticosteroids may be used to control severe ocular inflammation.

Options include:

• Topical corticosteroids
• Systemic corticosteroids
• Selected periocular therapy

However:

Antibiotic therapy is the essential treatment.

Corticosteroids should not substitute for adequate antimicrobial therapy.

Evidence for Steroids

Systemic corticosteroids are frequently used in severe:

• Posterior uveitis
• Optic neuritis
• Marked inflammatory disease

but controlled evidence proving additional benefit is limited.

If used, they should generally be administered:

With or after initiation of appropriate antibiotic therapy

rather than as isolated immunosuppression.

Cycloplegics

For anterior uveitis, cycloplegics may be used to:

• Relieve ciliary spasm
• Reduce pain
• Prevent posterior synechiae

Examples include:

• Cyclopentolate
• Homatropine
• Atropine in severe inflammation

Intravitreal Therapy

Intravitreal antimicrobial treatment is not routinely necessary when appropriate systemic penicillin therapy is given.

It may be considered only in unusual severe circumstances under specialist care.

Jarisch-Herxheimer Reaction

A Jarisch-Herxheimer reaction may occur within approximately 24 hours after treatment begins.

Features include:

• Fever
• Chills
• Headache
• Myalgia
• Temporary worsening of syphilitic lesions

It results from the inflammatory response to rapid spirochetal killing.

Management is generally:

Supportive

It is not a penicillin allergy.

Ocular Jarisch-Herxheimer Reaction

Rarely, ocular inflammation may transiently worsen after therapy begins.

Close observation is appropriate in patients with severe posterior disease or optic nerve involvement.

Congenital Syphilis

Congenital syphilis treatment depends on:

• Infant age
• Maternal treatment
• Neonatal examination
• Serology
• CSF evaluation

A commonly used regimen for confirmed or highly probable neonatal congenital syphilis is:

Aqueous crystalline penicillin G 50,000 units/kg/dose IV

given:

• Every 12 hours during the first 7 days of life
• Then every 8 hours

for a total of:

10 days

Alternative neonatal regimens are determined by pediatric infectious-disease protocols.

Partner Management

Sex partners require:

• Evaluation
• Serologic testing
• Treatment when indicated

This is essential to prevent:

• Reinfection
• Continued transmission

Public Health Considerations

Syphilis is a reportable infection in many jurisdictions.

Management may involve:

• Public health notification
• Partner services
• STI counseling

Follow-Up

Ophthalmic Follow-Up

Serial examination should assess:

• Visual acuity
• Anterior chamber inflammation
• Vitritis
• Retinitis
• Vasculitis
• Macular involvement
• Optic nerve function

Serologic Follow-Up

Treatment response is monitored with:

Quantitative RPR or VDRL titers

Use the same type of test when possible because RPR and VDRL titers are not directly interchangeable.

Expected Response

A favorable response generally includes:

• Clinical improvement
• Falling nontreponemal titers

A fourfold decline is a commonly used marker of adequate serologic response, although the expected timing varies with syphilis stage.

Serofast State

Some successfully treated patients remain persistently reactive at a low titer.

This is called:

Serofast

and does not automatically indicate treatment failure.

Interpretation depends on:

• Initial stage
• Initial titer
• Clinical response
• Reinfection risk

Treatment Failure or Reinfection

Consider further evaluation when there is:

• Recurrent ocular inflammation
• New syphilitic symptoms
• Sustained fourfold rise in RPR/VDRL titer
• Inadequate expected serologic response
• New exposure

Repeat Lumbar Puncture

Routine repeat CSF examination is generally unnecessary when there is:

• Appropriate clinical improvement
• Appropriate serologic response

unless neurologic or ocular findings fail to improve or recur.

Referral

Management should involve:

• Ophthalmology/uveitis specialist
• Infectious disease or sexual health specialist when appropriate

Neurology consultation may be useful when there are:

• Cranial neuropathies
• Cognitive changes
• Other neurologic manifestations

Patient Education

Patients should understand:

• Syphilis is treatable.
• Ocular syphilis requires intensive systemic therapy.
• Sexual partners may also require testing and treatment.
• Reinfection is possible.
• Follow-up blood testing is essential.
• HIV and other STI testing should be performed.

Prognosis

Visual prognosis depends on:

• Severity at presentation
• Duration before treatment
• Macular involvement
• Optic nerve involvement
• Degree of retinal ischemia
• Promptness of therapy

Early diagnosis and appropriate treatment often produce substantial visual recovery.

Poor Prognostic Features

Potentially unfavorable findings include:

• Severe visual loss at presentation
• Optic neuropathy
• Macular involvement
• Extensive retinitis
• Retinal vascular occlusion
• Delayed treatment
• Permanent retinal or optic nerve atrophy

Complications

Possible ocular complications include:

• Corneal scarring
• Cataract
• Secondary glaucoma
• Posterior synechiae
• Cystoid macular edema
• Retinal vascular occlusion
• Retinal detachment
• Macular atrophy
• Optic atrophy
• Permanent visual loss

Ophthalmology Pearls

• Syphilis is the “great masquerader” and can mimic almost any form of uveitis.
• Ocular syphilis can occur during any stage of systemic infection.
• All ocular syphilis should be treated with a neurosyphilis regimen, regardless of CSF findings.
• The preferred treatment is IV aqueous crystalline penicillin G for 10–14 days.
• A single IM dose of benzathine penicillin appropriate for uncomplicated early syphilis is not adequate treatment for active ocular syphilis.
• Acute syphilitic posterior placoid chorioretinitis is a particularly characteristic posterior manifestation.
• Diagnosis requires both a treponemal test and a quantitative nontreponemal test.
• RPR/VDRL is used for treatment monitoring; treponemal tests generally remain reactive and should not be used to monitor response.
• CSF examination is important when neurologic abnormalities are present, but isolated confirmed ocular disease does not require lumbar puncture before treatment.
• All patients should be tested for HIV and considered for other STI screening.
• Corticosteroids may control inflammation, but adequate antimicrobial treatment is the essential therapy.
• A Jarisch-Herxheimer reaction may temporarily worsen systemic or ocular inflammation after treatment begins.
• Prompt diagnosis is critical because syphilitic ocular disease is often highly treatable before irreversible retinal or optic nerve damage occurs.

Ophthalmology – Ocular Syphilis

Basics

Description

Ocular syphilis is ocular involvement by the spirochete Treponema pallidum.

Syphilis is a chronic systemic infection capable of affecting essentially any ocular structure and is known as the:

“Great masquerader”

because it can mimic many inflammatory, infectious, vascular, and neoplastic eye diseases.

Ocular involvement may occur during any stage of syphilis and may present as:

• Anterior uveitis
• Intermediate uveitis
• Posterior uveitis
• Panuveitis
• Retinitis
• Retinal vasculitis
• Chorioretinitis
• Optic neuropathy
• Interstitial keratitis

A key management principle is:

Ocular syphilis should be treated with a neurosyphilis regimen, even when cerebrospinal fluid findings are normal.

Etiology

The causative organism is:

Treponema pallidum

a motile spirochete.

Transmission

Acquired Syphilis

Transmission occurs primarily through direct contact with infectious lesions during:

• Vaginal intercourse
• Anal intercourse
• Oral sex

Congenital Syphilis

Transmission occurs:

Transplacentally from an infected mother to the fetus

Maternal screening and treatment during pregnancy are essential for prevention.

Epidemiology

Ocular syphilis accounts for a small but important proportion of uveitis.

Its frequency varies according to:

• Geographic region
• Syphilis prevalence
• HIV prevalence
• Population studied

Ocular disease may occur in both:

• HIV-negative patients
• People living with HIV

Risk Factors

Important risk factors include:

• Unprotected sexual exposure
• Multiple sexual partners
• Men who have sex with men
• HIV infection
• Other sexually transmitted infections
• Intravenous drug use
• Previous syphilis infection or inadequately treated infection

Systemic Stages of Acquired Syphilis

Primary Syphilis

Classically presents with:

Painless chancre

at the inoculation site.

Regional lymphadenopathy may occur.

Secondary Syphilis

May produce:

• Diffuse maculopapular rash
• Palmar and plantar lesions
• Generalized lymphadenopathy
• Fever
• Malaise
• Condylomata lata

Ocular manifestations are particularly important during secondary disease but can occur at any stage.

Latent Syphilis

Serologic evidence of infection without active clinical manifestations.

It is classified as:

• Early latent
• Late latent
• Unknown duration

Tertiary Syphilis

Potential manifestations include:

• Cardiovascular syphilis
• Gummatous disease
• Neurologic disease

Neurologic and ocular involvement can actually occur much earlier and should not be regarded as exclusively “tertiary.”

Congenital Syphilis

Early Manifestations

May include:

• Hepatosplenomegaly
• Mucocutaneous lesions
• Rhinitis
• Bone abnormalities
• Chorioretinitis

Late Manifestations

Classical findings include:

• Frontal bossing
• Saddle nose
• Saber shins
• Hutchinson teeth
• Sensorineural hearing loss
• Interstitial keratitis

The classic Hutchinson triad consists of:

• Interstitial keratitis
• Hutchinson teeth
• Sensorineural deafness

Pathophysiology

Ocular injury results from:

• Direct spirochetal infection
• Host inflammatory response
• Immune-mediated tissue injury
• Vascular inflammation

This can affect both the anterior and posterior segments.

Clinical Presentation

Patients may report:

• Blurred vision
• Floaters
• Photophobia
• Ocular pain
• Redness
• Scotoma
• Metamorphopsia
• Reduced color vision
• Sudden or progressive visual loss

Disease may be:

• Unilateral
• Bilateral
• Asymmetric

Important Clinical Principle

Syphilis can imitate almost any form of uveitis.

Therefore:

Syphilis testing should be considered in essentially all unexplained uveitis, particularly posterior or panuveitis.

Anterior Segment Manifestations

Possible findings include:

• Granulomatous anterior uveitis
• Non-granulomatous anterior uveitis
• Keratic precipitates
• Iris nodules
• Posterior synechiae
• Elevated IOP
• Scleritis
• Episcleritis

Interstitial Keratitis

Classically associated with congenital syphilis.

Features may include:

• Stromal corneal inflammation
• Corneal vascularization
• Photophobia
• Reduced vision

After inflammation resolves, residual:

Ghost vessels

may remain in the corneal stroma.

Vitreous Involvement

Syphilitic posterior disease commonly produces:

• Vitritis
• Haze
• Inflammatory cells

The amount of vitritis may vary considerably.

Posterior Segment Manifestations

Syphilis may produce:

• Retinitis
• Chorioretinitis
• Retinal vasculitis
• Retinal vascular occlusion
• Neuroretinitis
• Optic neuritis
• Optic disc edema
• Exudative retinal detachment
• Placoid chorioretinitis

Acute Syphilitic Posterior Placoid Chorioretinitis

A particularly characteristic manifestation is:

Acute syphilitic posterior placoid chorioretinitis (ASPPC)

Typical appearance:

• Large
• Yellow-gray
• Placoid lesion
• At or near the macula
• Often involving the outer retina and RPE

ASPPC should strongly raise suspicion for syphilis.

OCT Findings in ASPPC

OCT may show:

• Disruption of the ellipsoid zone
• Outer retinal abnormalities
• RPE irregularity
• Hyperreflective material at the RPE/photoreceptor interface
• Later restoration with successful treatment

Fluorescein Angiography

FA may demonstrate:

• Early hypofluorescence
• Late staining
• Retinal vascular leakage
• Optic disc leakage
• Vasculitis

Indocyanine Green Angiography

ICG may demonstrate areas of:

• Choroidal hypofluorescence
• Choriocapillaris involvement

in selected posterior cases.

Fundus Autofluorescence

May help demonstrate:

• RPE disturbance
• Extent of placoid lesions
• Evolution with treatment

Retinal Vasculitis

Syphilitic vasculitis may involve:

• Arteries
• Veins
• Both

It can lead to:

• Vascular occlusion
• Retinal ischemia
• Neovascular complications

Optic Nerve Manifestations

Possible manifestations include:

• Optic neuritis
• Optic perineuritis
• Neuroretinitis
• Papillitis
• Optic disc edema
• Optic atrophy

MRI may be useful when optic nerve or central neurologic involvement is suspected.

Pupillary Findings

The classic Argyll Robertson pupil:

• Accommodates to near
• Reacts poorly or not at all to light

It is historically associated with neurosyphilis but is uncommon in modern practice.

Cranial Neuropathies

Neurosyphilis may produce:

• Oculomotor nerve palsy
• Trochlear nerve palsy
• Abducens nerve palsy
• Other neurologic deficits

Diagnosis

Diagnosis combines:

• Compatible ocular findings
• Syphilis serology
• Exclusion of important mimics

No single ocular appearance confirms syphilis.

Serologic Testing

Testing generally includes both:

1. Nontreponemal test
2. Treponemal test

Nontreponemal Tests

Examples:

• RPR
• VDRL

These provide a quantitative titer and are useful for monitoring treatment response.

Nontreponemal Titers

A clinically meaningful change is generally:

Fourfold change in titer

For example:

• 1:32 → 1:8 = fourfold decline
• 1:8 → 1:32 = fourfold rise

Titers are therefore useful for:

• Monitoring therapy
• Detecting reinfection
• Detecting treatment failure

False-Positive Nontreponemal Tests

False-positive results may occur with:

• Autoimmune disease
• Pregnancy
• Infection
• Older age
• Other inflammatory states

Therefore, reactive nontreponemal testing requires confirmation with a treponemal assay.

Prozone Phenomenon

Very high antibody concentrations may rarely cause a falsely negative nontreponemal test.

If clinical suspicion is strong despite a negative RPR/VDRL, the laboratory can repeat testing using:

Serial dilution

to exclude a prozone effect.

Treponemal Tests

Examples include:

• TP-PA
• FTA-ABS
• Treponemal enzyme immunoassays
• Chemiluminescent immunoassays

These usually remain positive indefinitely after infection.

Therefore:

Treponemal tests should not be used to monitor treatment response.

Reverse-Sequence Screening

Many laboratories now begin with a:

Treponemal immunoassay

followed by quantitative RPR or VDRL.

Discordant results may require a second treponemal test such as TP-PA.

HIV Testing

All patients diagnosed with ocular syphilis should be offered:

HIV testing

because coinfection is important for:

• Overall management
• STI counseling
• Follow-up

Other STI screening should also be considered.

Lumbar Puncture

Older recommendations favored lumbar puncture in virtually all ocular syphilis.

Modern practice is more selective.

When CSF Examination Is Indicated

Lumbar puncture is particularly appropriate when there are:

• Cranial nerve abnormalities
• Meningeal symptoms
• Cognitive changes
• Motor or sensory deficits
• Other neurologic manifestations

CSF evaluation typically includes:

• Cell count
• Protein
• CSF-VDRL

Isolated Ocular Syphilis

If a patient has:

• Reactive syphilis serology
• Confirmed ocular abnormalities
• No neurologic findings

CSF examination is not required before treatment.

Most importantly:

Treatment should not be delayed for lumbar puncture.

CSF-VDRL

CSF-VDRL is:

• Highly specific
• Relatively insensitive

Therefore, a positive result strongly supports neurosyphilis, but a negative result does not completely exclude it.

Neuroimaging

MRI brain and/or orbits may be useful when there is:

• Optic neuropathy
• Cranial nerve palsy
• Focal neurologic deficit
• Concern for CNS disease

Differential Diagnosis

Because syphilis is a great masquerader, the differential is broad.

Consider:

• Sarcoidosis
• Tuberculosis
• Toxoplasmosis
• Acute retinal necrosis
• CMV retinitis
• Behçet disease
• VKH
• HLA-B27-associated uveitis
• Intermediate uveitis
• APMPPE
• Other white-dot syndromes
• Lyme disease
• Fungal endophthalmitis
• Toxocariasis
• Primary vitreoretinal lymphoma

Treatment

Critical Principle

All ocular syphilis should be treated using a neurosyphilis regimen.

Do not use standard single-dose benzathine penicillin treatment alone for active ocular syphilis.

First-Line Treatment

The preferred regimen is:

Aqueous crystalline penicillin G

Total:

18–24 million units/day IV

administered as:

• 3–4 million units IV every 4 hours

or

• Continuous infusion

for:

10–14 days

Alternative Penicillin Regimen

If reliable adherence can be ensured:

• Procaine penicillin G 2.4 million units IM once daily
• Plus probenecid 500 mg orally four times daily

for:

10–14 days

Additional Benzathine Penicillin

Because neurosyphilis regimens are shorter than those used for late latent syphilis, clinicians may consider:

Benzathine penicillin G 2.4 million units IM weekly for 1–3 weeks

after completion of neurosyphilis therapy in selected patients, particularly when the underlying stage would otherwise require a longer course.

Penicillin Allergy

For nonpregnant patients with penicillin allergy, an alternative that may be considered is:

Ceftriaxone 1–2 g IM or IV daily for 10–14 days

However, evidence is less extensive than for penicillin.

If there is concern about ceftriaxone safety or reliability of alternative therapy:

• Penicillin allergy testing
• Desensitization

should be considered.

Pregnancy

Pregnant patients with syphilis should receive:

Penicillin

because penicillin is the only proven treatment that reliably treats maternal infection and prevents fetal syphilis.

Patients with true penicillin allergy should undergo:

Desensitization followed by penicillin therapy

HIV Coinfection

People with HIV and ocular syphilis are treated with the:

Same neurosyphilis regimen

as patients without HIV.

HIV status does not justify using a less intensive regimen.

Adjunctive Corticosteroids

Corticosteroids may be used to control severe ocular inflammation.

Options include:

• Topical corticosteroids
• Systemic corticosteroids
• Selected periocular therapy

However:

Antibiotic therapy is the essential treatment.

Corticosteroids should not substitute for adequate antimicrobial therapy.

Evidence for Steroids

Systemic corticosteroids are frequently used in severe:

• Posterior uveitis
• Optic neuritis
• Marked inflammatory disease

but controlled evidence proving additional benefit is limited.

If used, they should generally be administered:

With or after initiation of appropriate antibiotic therapy

rather than as isolated immunosuppression.

Cycloplegics

For anterior uveitis, cycloplegics may be used to:

• Relieve ciliary spasm
• Reduce pain
• Prevent posterior synechiae

Examples include:

• Cyclopentolate
• Homatropine
• Atropine in severe inflammation

Intravitreal Therapy

Intravitreal antimicrobial treatment is not routinely necessary when appropriate systemic penicillin therapy is given.

It may be considered only in unusual severe circumstances under specialist care.

Jarisch-Herxheimer Reaction

A Jarisch-Herxheimer reaction may occur within approximately 24 hours after treatment begins.

Features include:

• Fever
• Chills
• Headache
• Myalgia
• Temporary worsening of syphilitic lesions

It results from the inflammatory response to rapid spirochetal killing.

Management is generally:

Supportive

It is not a penicillin allergy.

Ocular Jarisch-Herxheimer Reaction

Rarely, ocular inflammation may transiently worsen after therapy begins.

Close observation is appropriate in patients with severe posterior disease or optic nerve involvement.

Congenital Syphilis

Congenital syphilis treatment depends on:

• Infant age
• Maternal treatment
• Neonatal examination
• Serology
• CSF evaluation

A commonly used regimen for confirmed or highly probable neonatal congenital syphilis is:

Aqueous crystalline penicillin G 50,000 units/kg/dose IV

given:

• Every 12 hours during the first 7 days of life
• Then every 8 hours

for a total of:

10 days

Alternative neonatal regimens are determined by pediatric infectious-disease protocols.

Partner Management

Sex partners require:

• Evaluation
• Serologic testing
• Treatment when indicated

This is essential to prevent:

• Reinfection
• Continued transmission

Public Health Considerations

Syphilis is a reportable infection in many jurisdictions.

Management may involve:

• Public health notification
• Partner services
• STI counseling

Follow-Up

Ophthalmic Follow-Up

Serial examination should assess:

• Visual acuity
• Anterior chamber inflammation
• Vitritis
• Retinitis
• Vasculitis
• Macular involvement
• Optic nerve function

Serologic Follow-Up

Treatment response is monitored with:

Quantitative RPR or VDRL titers

Use the same type of test when possible because RPR and VDRL titers are not directly interchangeable.

Expected Response

A favorable response generally includes:

• Clinical improvement
• Falling nontreponemal titers

A fourfold decline is a commonly used marker of adequate serologic response, although the expected timing varies with syphilis stage.

Serofast State

Some successfully treated patients remain persistently reactive at a low titer.

This is called:

Serofast

and does not automatically indicate treatment failure.

Interpretation depends on:

• Initial stage
• Initial titer
• Clinical response
• Reinfection risk

Treatment Failure or Reinfection

Consider further evaluation when there is:

• Recurrent ocular inflammation
• New syphilitic symptoms
• Sustained fourfold rise in RPR/VDRL titer
• Inadequate expected serologic response
• New exposure

Repeat Lumbar Puncture

Routine repeat CSF examination is generally unnecessary when there is:

• Appropriate clinical improvement
• Appropriate serologic response

unless neurologic or ocular findings fail to improve or recur.

Referral

Management should involve:

• Ophthalmology/uveitis specialist
• Infectious disease or sexual health specialist when appropriate

Neurology consultation may be useful when there are:

• Cranial neuropathies
• Cognitive changes
• Other neurologic manifestations

Patient Education

Patients should understand:

• Syphilis is treatable.
• Ocular syphilis requires intensive systemic therapy.
• Sexual partners may also require testing and treatment.
• Reinfection is possible.
• Follow-up blood testing is essential.
• HIV and other STI testing should be performed.

Prognosis

Visual prognosis depends on:

• Severity at presentation
• Duration before treatment
• Macular involvement
• Optic nerve involvement
• Degree of retinal ischemia
• Promptness of therapy

Early diagnosis and appropriate treatment often produce substantial visual recovery.

Poor Prognostic Features

Potentially unfavorable findings include:

• Severe visual loss at presentation
• Optic neuropathy
• Macular involvement
• Extensive retinitis
• Retinal vascular occlusion
• Delayed treatment
• Permanent retinal or optic nerve atrophy

Complications

Possible ocular complications include:

• Corneal scarring
• Cataract
• Secondary glaucoma
• Posterior synechiae
• Cystoid macular edema
• Retinal vascular occlusion
• Retinal detachment
• Macular atrophy
• Optic atrophy
• Permanent visual loss

Ophthalmology Pearls

• Syphilis is the “great masquerader” and can mimic almost any form of uveitis.
• Ocular syphilis can occur during any stage of systemic infection.
• All ocular syphilis should be treated with a neurosyphilis regimen, regardless of CSF findings.
• The preferred treatment is IV aqueous crystalline penicillin G for 10–14 days.
• A single IM dose of benzathine penicillin appropriate for uncomplicated early syphilis is not adequate treatment for active ocular syphilis.
• Acute syphilitic posterior placoid chorioretinitis is a particularly characteristic posterior manifestation.
• Diagnosis requires both a treponemal test and a quantitative nontreponemal test.
• RPR/VDRL is used for treatment monitoring; treponemal tests generally remain reactive and should not be used to monitor response.
• CSF examination is important when neurologic abnormalities are present, but isolated confirmed ocular disease does not require lumbar puncture before treatment.
• All patients should be tested for HIV and considered for other STI screening.
• Corticosteroids may control inflammation, but adequate antimicrobial treatment is the essential therapy.
• A Jarisch-Herxheimer reaction may temporarily worsen systemic or ocular inflammation after treatment begins.
• Prompt diagnosis is critical because syphilitic ocular disease is often highly treatable before irreversible retinal or optic nerve damage occurs.

Ophthalmology – Ocular Surface Squamous Neoplasia (OSSN)

Basics

Description

Ocular surface squamous neoplasia (OSSN) describes a spectrum of dysplastic and malignant squamous epithelial lesions involving the:

• Conjunctiva
• Cornea
• Limbus

The spectrum includes:

• Mild epithelial dysplasia
• Moderate/severe dysplasia
• Carcinoma in situ
• Invasive squamous cell carcinoma (SCC)

The modern concept is that OSSN represents a continuum from intraepithelial disease to stromal invasion.

⸻

Key Pathologic Distinction

Intraepithelial OSSN

Abnormal squamous cells remain confined above the epithelial basement membrane.

This includes:

• Mild dysplasia
• Moderate dysplasia
• Severe dysplasia
• Carcinoma in situ

Historically these lesions were often called:

Conjunctival intraepithelial neoplasia (CIN)

⸻

Invasive Squamous Cell Carcinoma

Invasive SCC occurs when atypical epithelial cells:

Breach the basement membrane and invade the underlying substantia propria or deeper tissues.

Advanced tumors may invade:

• Sclera
• Cornea
• Anterior chamber
• Orbit

Regional or distant metastasis is uncommon but possible.

⸻

Epidemiology

OSSN is one of the most common malignant tumors of the ocular surface.

Incidence varies markedly by:

• Geographic region
• Ultraviolet exposure
• HIV prevalence
• Population demographics

It is more common in:

• Older adults in temperate regions
• Younger adults in high-UV regions with HIV-associated disease

⸻

Risk Factors

Important risk factors include:

• Chronic ultraviolet-B exposure
• Increasing age
• Male sex in many populations
• Light skin pigmentation
• Smoking
• HIV infection
• Systemic immunosuppression
• Organ transplantation
• Xeroderma pigmentosum
• Chronic ocular surface disease

⸻

HPV

Human papillomavirus, particularly high-risk types such as:

• HPV 16
• HPV 18

has been detected in some OSSN lesions.

However:

The strength of the association varies between studies and geographic populations.

HPV is not considered necessary for development of OSSN.

⸻

Genetics and Molecular Biology

UV-induced DNA damage is believed to be an important mechanism.

Molecular alterations may involve:

• TP53
• Cell-cycle dysregulation
• Abnormal epithelial proliferation

Chronic UV exposure can produce characteristic DNA damage within ocular surface epithelial cells.

⸻

Pathophysiology

OSSN develops through progressive epithelial dysplasia.

A simplified sequence is:

UV or other carcinogenic injury → epithelial DNA damage → dysplasia → carcinoma in situ → invasive SCC

Immunosuppression can reduce normal immune surveillance and accelerate tumor development.

⸻

Associated Conditions

Important associations include:

• HIV/AIDS
• Organ transplantation
• Chronic systemic immunosuppression
• Xeroderma pigmentosum
• Atopic disease
• Other UV-related cutaneous malignancies

⸻

Prevention

Risk reduction includes:

• UV-blocking sunglasses
• Brimmed hats
• Smoking cessation
• Appropriate management of immunosuppression when possible

No strategy completely prevents OSSN.

⸻

Clinical Presentation

Patients may be asymptomatic or report:

• Ocular irritation
• Foreign-body sensation
• Redness
• Visible conjunctival lesion
• Persistent “pterygium”
• Decreased vision if the cornea or visual axis is involved

⸻

Typical Location

OSSN most commonly develops in the:

Interpalpebral limbal region

especially at the:

• Temporal limbus
• Nasal limbus

This distribution reflects chronic UV exposure.

⸻

Clinical Appearance

Conjunctival lesions may appear:

• Gelatinous
• Papilliform
• Leukoplakic
• Nodular
• Sessile
• Diffuse

They may be:

• Amelanotic
• Partially pigmented

⸻

Leukoplakia

A white surface plaque represents:

Hyperkeratosis

and is commonly seen in OSSN.

Marked leukoplakia may obscure underlying vascularity.

⸻

Corneal Extension

Corneal involvement often appears as:

• Gray-white epithelial opacity
• Translucent epithelial sheet
• Irregular or feathery margins
• Pseudopod-like epithelial extensions

Corneal disease remains superficial until invasive disease penetrates deeper layers.

⸻

Feeder Vessels

Prominent feeder vessels may occur.

Large or rapidly growing vessels may increase suspicion for:

• Invasive SCC
• Larger tumor burden

⸻

Signs Suggesting Invasion

Features concerning for invasive disease include:

• Fixed lesion
• Nodularity
• Marked thickness
• Scleral adherence
• Large feeder vessels
• Significant keratinization
• Intraocular inflammation
• Secondary glaucoma
• Orbital extension

⸻

Important Clinical Principle

CIN/carcinoma in situ and invasive SCC cannot be reliably distinguished by appearance alone.

Histopathology remains the gold standard when invasion is suspected.

⸻

Examination

A complete ocular surface examination should include:

• Visual acuity
• Slit-lamp evaluation
• Eyelid eversion
• Careful limbal examination
• Corneal assessment
• Palpation if a nodular lesion is present
• Regional lymph node examination in advanced disease

⸻

Gonioscopy

Gonioscopy is indicated when there is concern for intraocular extension.

Look for:

• Angle involvement
• Abnormal tissue
• Secondary glaucoma
• Anterior chamber invasion

⸻

Intraocular Invasion Warning

In a patient with known or suspected invasive OSSN, the combination of:

• Uveitis
• Elevated IOP
• Anterior chamber mass
• Persistent inflammation

should raise concern for:

Intraocular tumor extension

until proven otherwise.

⸻

Anterior Segment OCT

High-resolution anterior segment OCT is now one of the most useful noninvasive tools for OSSN.

Typical features include:

• Thickened hyperreflective epithelium
• Abrupt transition from normal to abnormal epithelium
• Sharp epithelial demarcation
• Shadowing in thick lesions

AS-OCT is useful for:

• Supporting diagnosis
• Defining tumor extent
• Monitoring response to topical therapy
• Detecting subclinical residual disease

⸻

Ultrasound Biomicroscopy

UBM may help when there is concern for:

• Deep stromal invasion
• Scleral involvement
• Intraocular extension
• Ciliary body involvement

It is especially useful for thicker limbal lesions.

⸻

Impression Cytology

Impression cytology may detect atypical epithelial cells.

It can be useful when:

• A noninvasive diagnostic approach is desired
• Disease is diffuse
• Topical therapy is being considered

However:

It cannot reliably assess stromal invasion.

Therefore, suspicious invasive lesions require biopsy.

⸻

Histopathology

Mild Dysplasia

Atypical cells occupy:

• Lower portions of the epithelium

with partial loss of maturation.

⸻

Severe Dysplasia / Carcinoma in Situ

Atypical cells involve:

Full thickness of the epithelium

without penetration through the basement membrane.

⸻

Invasive SCC

Shows:

• Squamous atypia
• Dyskeratosis
• Keratinization
• Invasion into underlying stroma

⸻

Rare Aggressive Variants

Mucoepidermoid Carcinoma

May demonstrate:

• Squamous differentiation
• Mucin-producing cells
• Greater tendency for deeper invasion

⸻

Spindle Cell / Sarcomatoid SCC

This variant may show:

• Spindle-shaped malignant cells
• More aggressive local behavior
• Higher metastatic potential

⸻

HIV Testing

Consider HIV testing particularly in:

• Younger patients
• Aggressive OSSN
• Multifocal disease
• Patients with other signs of immunosuppression

⸻

Differential Diagnosis

Benign Mimics

• Pterygium
• Pinguecula
• Papilloma
• Pyogenic granuloma
• Conjunctivitis
• Conjunctival nevus
• Limbal dermoid

⸻

Malignant Mimics

• Amelanotic melanoma
• Conjunctival melanoma
• Sebaceous carcinoma with pagetoid spread
• Lymphoma
• Metastatic tumor

⸻

OSSN vs Pterygium

Features favoring OSSN include:

• Irregular thickened epithelium
• Leukoplakia
• Prominent feeder vessel
• Gelatinous appearance
• Atypical corneal epithelial extension
• Abrupt epithelial transition on AS-OCT

A recurrent or atypical “pterygium” should be evaluated carefully.

⸻

Treatment Principles

Treatment depends on:

• Tumor size
• Thickness
• Location
• Circumferential limbal involvement
• Suspicion for invasion
• Prior recurrence
• Patient adherence
• Ability to follow closely

Modern treatment includes both:

• Surgical excision
• Topical medical therapy

Topical therapy is now an established treatment for many superficial OSSN lesions.

⸻

Surgical Excision

Localized or invasive-appearing lesions are often treated with:

Excisional biopsy using a no-touch technique

Goals include:

• Diagnostic confirmation
• Complete tumor removal
• Minimal manipulation of the tumor surface

⸻

No-Touch Technique

Typical principles include:

• Avoid direct manipulation of tumor
• Wide enough clinically clear conjunctival margins
• Superficial keratectomy for corneal component
• Removal of involved superficial sclera if necessary
• Adjunctive cryotherapy to conjunctival margins

⸻

Surgical Margins

Traditional excisions often use several millimeters of clinically normal tissue.

Margin width is individualized according to:

• Tumor size
• Suspicion of invasion
• Anatomic constraints

Excessively wide excision should be avoided when it would create unnecessary limbal stem cell deficiency.

⸻

Cryotherapy

Double freeze-thaw cryotherapy may be applied to:

• Conjunctival margins

to reduce recurrence from microscopic residual disease.

Care must be taken to avoid excessive tissue damage.

⸻

Ocular Surface Reconstruction

Large excisions may require:

• Amniotic membrane graft
• Conjunctival autograft
• Other ocular surface reconstruction

This helps reduce:

• Scarring
• Symblepharon
• Limbal stem cell deficiency

⸻

Topical Therapy

Topical treatment may be used:

• As primary therapy
• Before surgery to shrink a lesion
• After incomplete excision
• For recurrent disease
• For multifocal or diffuse disease

Major agents include:

• 5-fluorouracil
• Mitomycin C
• Interferon alfa-2b

⸻

5-Fluorouracil

Topical 5-FU 1% is widely used.

A common regimen is:

• Four times daily
• Given in treatment cycles

Advantages include:

• Relatively inexpensive
• Effective for broad epithelial disease
• Useful for diffuse lesions

Potential adverse effects include:

• Ocular irritation
• Epitheliopathy
• Conjunctivitis
• Keratitis

⸻

Mitomycin C

Topical MMC is highly effective.

Common concentrations include:

• 0.02%
• 0.04%

Usually given in cycles rather than continuously.

Potential toxicity includes:

• Significant conjunctivitis
• Epitheliopathy
• Punctal stenosis
• Limbal stem cell deficiency
• Scleral complications

Therefore:

MMC is effective but generally more toxic to the ocular surface than 5-FU or interferon.

⸻

Interferon Alfa-2b

Interferon alfa-2b has historically been used as:

• Topical drops
• Perilesional/subconjunctival injection

Advantages include relatively low ocular surface toxicity.

Adverse effects may include:

• Follicular conjunctivitis
• Local irritation
• Flu-like symptoms with injections

Availability has become limited in some regions, so 5-FU is often used more commonly today.

⸻

Choice of Topical Agent

A practical approach:

• 5-FU → inexpensive, effective, commonly available
• MMC → potent but more toxic
• Interferon → well tolerated but availability/cost may limit use

Choice depends on:

• Tumor characteristics
• Patient tolerance
• Cost
• Availability
• Physician experience

⸻

Medical Therapy and Invasive Disease

Topical agents treat:

Epithelial disease

but penetrate poorly into deeply invasive tumor.

Therefore:

Suspected invasive SCC should generally be biopsied and managed surgically and/or with additional oncologic therapy rather than topical therapy alone.

⸻

Monitoring During Topical Therapy

Follow-up should assess:

• Clinical tumor regression
• Corneal involvement
• Limbal disease
• Toxicity
• Residual subclinical epithelium

AS-OCT is particularly useful for detecting persistent disease beneath a clinically normal-looking surface.

⸻

Plaque Brachytherapy

Plaque radiotherapy may be considered for selected:

• Deep scleral invasion
• Intraocular extension
• Recurrent invasive disease

It is not routine for uncomplicated superficial OSSN.

⸻

Intraocular Invasion

Extensive intraocular involvement may require:

• Plaque radiotherapy
• Enucleation in severe cases

Management should involve ocular oncology.

⸻

Orbital Invasion

Extensive orbital spread may require:

• Radical surgery
• Radiation
• Systemic oncologic therapy

Exenteration is now reserved for selected advanced cases.

⸻

Regional Metastasis

Advanced SCC may spread to:

• Preauricular lymph nodes
• Submandibular lymph nodes
• Cervical nodes
• Parotid nodes

Distant metastasis is rare but can involve:

• Lung
• Bone
• Other organs