Ophthalmology – Lyme Disease

Basics

Description

Lyme disease is a multisystem infectious disease caused by Borrelia burgdorferi, a spirochete transmitted by infected Ixodes ticks.

It may involve the:

• Skin
• Nervous system
• Heart
• Joints
• Eyes

Ocular involvement can occur at several stages and may affect almost any ocular structure.

Epidemiology

Lyme disease is one of the most common tick-borne diseases in temperate regions of the Northern Hemisphere.

It is especially important in endemic regions of:

• Northeastern United States
• Mid-Atlantic United States
• Upper Midwest
• Europe
• Parts of Asia

Cases occur most often during spring, summer, and early fall, corresponding to periods of tick activity.

Risk Factors

Important risk factors include:

• Residence in an endemic area
• Travel to an endemic area
• Outdoor exposure in wooded or grassy areas
• Tick bite
• Exposure to deer, rodents, and tick-infested environments

General Prevention

The most effective preventive strategy is avoidance of tick bites.

Measures include:

• Avoiding dense brush and tall grasses when possible
• Wearing long sleeves and long pants
• Wearing light-colored clothing to make ticks easier to identify
• Using appropriate tick repellents such as DEET
• Performing a thorough skin and scalp examination after outdoor activity
• Showering after returning indoors
• Checking children carefully for ticks
• Checking outdoor pets
• Removing attached ticks promptly

Etiology

Lyme disease is caused by Borrelia burgdorferi, a motile spirochete.

Transmission occurs through the bite of infected Ixodes ticks.

Small mammals, especially rodents, act as important reservoirs.

Humans are incidental hosts.

Person-to-person transmission does not occur through ordinary contact.

Pathophysiology

After entering through the skin, the organism can disseminate through tissues and the bloodstream.

Borrelia can evade host immunity through changes in its surface proteins and interaction with complement regulatory pathways.

The clinical manifestations result from:

• Direct infection
• Tissue invasion
• Host inflammatory response
• Immune-mediated injury

Ocular manifestations may therefore reflect either active infection or secondary immune inflammation.

Diagnosis

History

Important questions include:

• Recent tick bite
• Travel to or residence in an endemic area
• Outdoor exposure
• Previous erythema migrans rash
• Fever or flu-like symptoms
• Joint pain
• Cardiac symptoms
• Neurologic symptoms

Ocular symptoms may include:

• Blurred vision
• Eye pain
• Redness
• Diplopia
• Floaters
• Photophobia
• Progressive visual loss

Clinical Stages

Early Localized Disease

The classic early manifestation is erythema migrans.

This is usually:

• Expanding
• Erythematous
• Often greater than several centimeters
• Sometimes associated with central clearing

It may produce the classic bull’s-eye appearance, although many lesions do not have this exact morphology.

The rash is often neither painful nor itchy.

Associated symptoms may include:

• Fever
• Chills
• Fatigue
• Headache
• Myalgia
• Arthralgia
• Lymphadenopathy

Early Ocular Findings

Possible findings include:

• Conjunctivitis
• Periorbital edema

Early Disseminated Disease

Dissemination can occur over weeks to months.

Systemic manifestations may involve:

• Nervous system
• Heart
• Joints
• Skin

Neurologic Manifestations

These may include:

• Meningitis
• Cranial neuropathy
• Radiculopathy
• Facial nerve palsy
• Headache
• Photophobia

Cardiac Manifestations

These may include:

• Palpitations
• Arrhythmia
• Atrioventricular block

Ocular Manifestations

Lyme disease can produce a broad range of ophthalmic findings.

External and Anterior Segment

Possible manifestations include:

• Conjunctivitis
• Episcleritis
• Scleritis
• Keratitis
• Exposure keratopathy secondary to facial nerve palsy
• Anterior uveitis
• Granulomatous uveitis

Cranial Nerve Palsies

Lyme disease can involve cranial nerves, including:

• CN III
• CN IV
• CN VI
• CN VII

Patients may present with:

• Diplopia
• Ptosis
• Extraocular motility abnormalities
• Facial weakness

Facial nerve palsy may lead to lagophthalmos and exposure keratopathy.

Intermediate and Posterior Segment Disease

Reported manifestations include:

• Pars planitis
• Vitritis
• Choroiditis
• Retinitis
• Macular edema
• Retinal vascular occlusion
• Retinal vasculitis

These findings are less common than neurologic or anterior segment manifestations.

Optic Nerve Manifestations

Possible findings include:

• Optic neuritis
• Retrobulbar optic neuritis
• Optic disc edema
• Ischemic optic neuropathy
• Optic atrophy

Patients may develop:

• Reduced visual acuity
• Dyschromatopsia
• Relative afferent pupillary defect
• Visual field defects

Late Disease

Late manifestations can persist or recur over months to years.

Systemic disease may include:

• Arthritis
• Chronic neurologic manifestations
• Acrodermatitis chronica atrophicans in some geographic regions

Late ocular findings may include:

• Stromal keratitis
• Episcleritis
• Orbital myositis
• Chronic uveitis
• Rare severe visual pathway involvement

Physical Examination

A complete examination should include:

• General physical examination
• Neurologic examination
• Full ophthalmic examination

Ophthalmic assessment should include:

• Visual acuity
• Pupillary examination
• Ocular motility
• Cranial nerve testing
• Slit-lamp examination
• IOP
• Dilated fundus examination

Diagnostic Testing

Serology

Laboratory diagnosis is based on two-tier serologic testing in the appropriate clinical setting.

Modern testing generally begins with an antibody screening immunoassay followed by a confirmatory second assay according to current testing algorithms.

Interpretation depends heavily on:

• Timing of symptoms
• Clinical presentation
• Pretest probability

Early infection can be seronegative before antibodies develop.

Cerebrospinal Fluid

Lumbar puncture may be indicated when there is concern for:

• Meningitis
• Neuroborreliosis
• Significant neurologic manifestations

CSF evaluation may include:

• Cell count
• Protein
• Intrathecal antibody assessment when appropriate

Additional Testing

Depending on the differential diagnosis, testing may include:

• Syphilis serology
• Other infectious testing
• Neuroimaging
• OCT
• Fluorescein angiography

These are guided by the specific ocular manifestation.

Differential Diagnosis

For optic nerve edema, retinitis, or neuro-ophthalmic disease, important alternatives include:

• Syphilis
• Cat-scratch disease
• Toxoplasmosis
• Acute retinal necrosis
• Multiple sclerosis
• Other infectious or inflammatory uveitides

Treatment

Treatment depends on the stage of disease and whether neurologic involvement is present.

Early Lyme Disease

Oral antibiotics are typically used.

Common agents include:

• Doxycycline
• Amoxicillin
• Cefuroxime axetil

Selection depends on:

• Age
• Pregnancy status
• Allergies
• Clinical manifestation

Neuro-Ophthalmic or Neurologic Lyme Disease

Patients with meningitis, significant cranial neuropathy, or other neuroborreliosis may require more intensive antibiotic therapy.

Depending on the presentation, treatment may include:

• Oral doxycycline
• Intravenous ceftriaxone

The exact regimen should follow current infectious-disease guidelines.

Ocular Inflammation

Inflammatory ocular manifestations may require treatment in addition to antibiotics.

Examples include:

• Topical corticosteroids for anterior uveitis
• Cycloplegic agents for pain and synechiae prevention
• Systemic anti-inflammatory therapy in selected severe disease

Antimicrobial treatment of the underlying Lyme infection should not be omitted when active infection is suspected.

Tick Removal

An attached tick should be removed promptly with fine-tipped forceps.

Recommended technique:

• Grasp the tick close to the skin
• Pull upward steadily
• Avoid twisting
• Avoid crushing or squeezing the body
• Clean the bite site afterward

Prompt removal reduces the likelihood of transmission.

Follow-Up

Follow-up depends on the severity of ocular disease.

Patients with active uveitis, optic nerve disease, or significant neuro-ophthalmic manifestations require close monitoring.

Follow-up should assess:

• Visual acuity
• Pupillary function
• Ocular motility
• Degree of inflammation
• IOP
• Optic nerve appearance
• Retinal findings

Patient Education

Patients should be advised to:

• Use protective clothing outdoors
• Use tick repellent appropriately
• Perform skin checks
• Remove ticks promptly
• Seek evaluation for expanding rash or new neurologic symptoms
• Report new visual symptoms promptly

Prognosis

Most appropriately diagnosed and treated patients have a favorable outcome.

Prognosis depends on:

• Speed of diagnosis
• Severity of neurologic involvement
• Type of ocular involvement
• Presence of optic nerve or retinal damage

Some inflammatory manifestations may persist despite eradication of infection.

Complications

Ophthalmic complications can include:

• Chronic uveitis
• Keratitis
• Scleritis
• Cranial nerve palsy
• Optic neuropathy
• Retinal vasculitis
• Macular edema
• Permanent visual loss

Key Clinical Pearls

• Lyme disease is caused by Borrelia burgdorferi and transmitted by Ixodes ticks.
• The classic early manifestation is erythema migrans, but not every patient recalls a rash or tick bite.
• Ocular involvement is diverse and may include conjunctivitis, uveitis, cranial nerve palsies, keratitis, optic neuritis, and retinitis.
• Facial nerve palsy can produce lagophthalmos and exposure keratopathy.
• Diagnosis relies on clinical context plus appropriate serologic testing.
• In neuro-ophthalmic disease, consider neuroborreliosis and coordinate treatment with infectious disease or neurology.
• Always consider alternative diagnoses such as syphilis, cat-scratch disease, toxoplasmosis, and acute retinal necrosis when posterior segment or optic nerve findings are present.

Ophthalmology – Lowe Syndrome

Basics

Description

Lowe syndrome, also called oculocerebrorenal syndrome of Lowe, is a rare multisystem disorder affecting primarily the eyes, nervous system, and kidneys.

The classic clinical pattern includes congenital ocular abnormalities, neurologic dysfunction, and proximal renal tubular disease.

Epidemiology

Lowe syndrome is very rare.

It almost exclusively affects males because it is usually inherited in an X-linked recessive pattern.

Genetics

Lowe syndrome is caused by pathogenic variants in the OCRL gene on chromosome Xq24–26.

The OCRL protein is an inositol polyphosphate 5-phosphatase involved in phosphoinositide metabolism and intracellular membrane trafficking.

Approximately one-third of affected males may have a de novo mutation, meaning there is no previous family history.

Rare affected females have been described, usually because of unusual X-chromosome abnormalities or highly skewed X-inactivation.

Inheritance

Because the disease is X-linked recessive, a female carrier has, with each pregnancy:

• A 25% chance of having an affected son
• A 25% chance of having an unaffected son
• A 25% chance of having a carrier daughter
• A 25% chance of having a noncarrier daughter

Genetic counseling is therefore important for affected families.

Pathophysiology

Loss of normal OCRL function causes abnormal phosphoinositide metabolism.

This disrupts several cellular processes, including:

• Membrane trafficking
• Endocytosis
• Cytoskeletal organization
• Maintenance of tight and adherens junctions
• Protein transport

These abnormalities contribute to the ocular, neurologic, and renal manifestations.

Ocular Pathophysiology

Cataract

Congenital cataracts are thought to result from abnormal development and migration of lens epithelial cells.

The cataracts are usually:

• Bilateral
• Dense
• Present at birth

They may involve the posterior lens and can severely impair visual development if untreated.

Glaucoma

Infantile glaucoma is associated with goniodysgenesis, meaning abnormal development of the anterior chamber angle.

This can cause elevated intraocular pressure early in life.

Commonly Associated Ocular Conditions

Important ocular manifestations include:

• Congenital cataract
• Infantile glaucoma
• Conjunctival or corneal keloid-like lesions
• Late retinal dystrophy
• Amblyopia
• Reduced vision

Neurologic Manifestations

Neurologic abnormalities commonly include:

• Generalized hypotonia
• Reduced or absent deep tendon reflexes
• Poor suck reflex in infancy
• Developmental delay
• Intellectual disability
• Behavioral disturbances
• Seizures

Hypotonia can be pronounced during infancy.

Renal Manifestations

The characteristic renal abnormality is proximal renal tubular dysfunction, often resembling Fanconi syndrome.

Findings may include:

• Proteinuria
• Proximal renal tubular acidosis
• Phosphate wasting
• Aminoaciduria
• Hypercalciuria
• Potassium disturbances
• Progressive renal impairment

Renal disease contributes substantially to systemic morbidity.

Skeletal Complications

Renal phosphate loss can result in:

• Renal rickets
• Osteomalacia
• Pathologic fractures
• Growth failure

Hypercalciuria can cause:

• Nephrocalcinosis
• Nephrolithiasis

Other Associated Conditions

Additional systemic findings can include:

• Cryptorchidism
• Failure to thrive
• Characteristic facial appearance
• Recurrent respiratory or gastrointestinal infections

Diagnosis

History

Important clues include:

• Family history of an X-linked disorder
• Congenital or early visual impairment
• Cataract noted in infancy
• Signs of infantile glaucoma
• Failure to thrive
• Developmental delay
• Hypotonia
• Seizures
• Renal abnormalities

Ocular Symptoms

Infants with glaucoma may develop:

• Photophobia
• Excessive tearing
• Corneal clouding
• Enlarged globe or buphthalmos

Congenital cataract may cause poor fixation or reduced visual responsiveness.

Physical Examination

General Examination

Children may demonstrate:

• Hypotonia
• Poor growth
• Developmental delay
• Characteristic facies
• Prominent or elongated forehead
• Fair complexion

Height, weight, and head circumference should be tracked carefully.

Ophthalmic Examination

A full examination should evaluate for:

• Congenital cataract
• Corneal clarity
• Corneal diameter
• Intraocular pressure
• Anterior chamber angle abnormalities
• Optic nerve damage
• Conjunctival or corneal keloids
• Retinal disease

Examination under anesthesia may be required in infants or uncooperative young children.

Carrier Females

Female carriers may show characteristic lens abnormalities despite being otherwise clinically unaffected.

These may include:

• Multiple fine punctate lens opacities
• Radially distributed or wedge-shaped lens changes
• Posterior lens opacities in some cases

Careful slit-lamp examination of the mother may therefore provide a useful diagnostic clue.

Diagnostic Tests

Laboratory Studies

Important investigations include:

• Renal function tests
• Serum electrolytes
• Urinalysis
• Urinary amino acids
• Assessment of acid-base status

These help characterize the degree of proximal tubular dysfunction.

Genetic Testing

Molecular testing for an OCRL mutation confirms the diagnosis in most cases.

Genetic testing also assists with:

• Carrier identification
• Family counseling
• Prenatal counseling

Neuroimaging

Brain MRI may show:

• Mild ventriculomegaly
• Periventricular cystic changes
• Other white-matter abnormalities

These findings may remain relatively stable over time.

Ophthalmic Imaging

If the fundus cannot be visualized because of dense cataract, B-scan ultrasonography may be helpful.

Optic nerve photography can assist with long-term glaucoma monitoring.

Pathological Findings

Lens abnormalities may include:

• Small discoid cataracts
• Posterior lenticonus
• Abnormal fetal nuclear development
• Capsular abnormalities

Anterior chamber pathology may demonstrate:

• Immature angle structures
• Anterior displacement of rudimentary ciliary processes

Retinal abnormalities can include:

• Peripheral cystoid degeneration
• Retinal folds
• Vascular hyalinization
• Mild gliosis

Differential Diagnosis

Important differential diagnoses include:

• Congenital rubella
• Peroxisomal disorders
• Mitochondrial disorders
• Other congenital cataract syndromes
• Other disorders combining developmental delay and renal disease

The combination of congenital cataract + infantile glaucoma + proximal renal tubular dysfunction strongly supports Lowe syndrome.

Treatment

Treatment is multidisciplinary and directed at the individual manifestations.

Cataract Management

Congenital cataracts often require early cataract surgery to prevent profound deprivation amblyopia.

After surgery, visual rehabilitation may require:

• Aphakic spectacles
• Contact lenses
• Intraocular lens implantation in selected patients
• Amblyopia therapy

Timing depends on age, cataract density, and overall clinical status.

Glaucoma Management

Infantile glaucoma may require:

• Medical IOP-lowering treatment initially
• Surgical treatment when angle abnormalities are significant

Common initial surgical procedures include:

• Goniotomy
• Trabeculotomy

Long-term monitoring is essential because glaucoma can cause irreversible optic nerve injury.

Amblyopia

Amblyopia should be treated aggressively when present.

Management may include:

• Optical correction
• Patching
• Penalization
• Early visual rehabilitation

Visual development should be monitored closely.

Low-Vision Rehabilitation

Children with residual visual impairment may benefit from:

• Low-vision assessment
• Educational accommodations
• Magnification devices
• Developmental visual support

Renal Treatment

Renal management may include:

• Sodium bicarbonate
• Sodium or potassium citrate
• Phosphate replacement
• Vitamin D supplementation

Treatment is individualized according to the child’s biochemical abnormalities.

The goal is to maintain appropriate:

• Calcium
• Phosphate
• Acid-base balance
• Parathyroid hormone levels

Renal Failure

Progressive renal insufficiency can eventually require:

• Dialysis
• Renal transplantation

Management should be coordinated with pediatric nephrology.

Neurologic Treatment

Treatment may include:

• Antiseizure medications
• Developmental therapy
• Physical therapy
• Occupational therapy
• Speech therapy

Behavioral problems may require psychological or psychiatric management.

Referral

Patients typically require coordinated care involving:

• Pediatric ophthalmology
• Glaucoma specialist
• Medical genetics
• Nephrology
• Neurology
• Developmental pediatrics
• Physical therapy
• Occupational therapy
• Speech therapy
• Psychology or psychiatry

Surgical referral may also be needed for cryptorchidism.

Follow-Up

Regular ophthalmic follow-up is required for:

• Cataract management
• Glaucoma surveillance
• Optic nerve monitoring
• Amblyopia treatment
• Retinal dystrophy
• Visual development

Systemic monitoring should include:

• Renal function
• Growth
• Electrolytes
• Bone health
• Development
• Seizure control

Diet

Dietary recommendations are primarily determined by the degree of renal tubular dysfunction.

Patients may require individualized management of:

• Phosphate
• Sodium
• Potassium
• Calcium
• Fluid intake

A pediatric nephrologist or dietitian should guide these adjustments.

Patient Education

Families should understand that Lowe syndrome is a chronic multisystem genetic disorder requiring lifelong coordinated care.

Genetic counseling is particularly important for:

• Mothers
• Sisters
• Other potentially affected female relatives

Families should also be educated about:

• Seizures
• Renal complications
• Glaucoma symptoms
• Visual rehabilitation
• Developmental services

Prognosis

Prognosis varies according to the severity of renal, neurologic, and respiratory involvement.

Historically, life expectancy has been reduced, with major causes of mortality including:

• Progressive renal disease
• Respiratory complications
• Seizures
• Severe infections

Some patients survive well into adulthood with modern multidisciplinary care.

Visual Prognosis

Visual outcome depends primarily on:

• Timing of cataract treatment
• Severity and control of glaucoma
• Development of amblyopia
• Presence of retinal dystrophy

Early cataract and glaucoma treatment can produce meaningful visual benefit.

Later retinal dystrophy can limit long-term visual potential.

Complications

Major complications include:

• Congenital cataract
• Amblyopia
• Infantile glaucoma
• Optic nerve damage
• Retinal dystrophy
• Developmental delay
• Seizures
• Renal insufficiency
• Rickets and fractures
• Nephrocalcinosis
• Respiratory complications

Key clinical pearl: Lowe syndrome should be suspected in a male infant with bilateral congenital cataracts, infantile glaucoma, severe hypotonia/developmental delay, and proximal renal tubular dysfunction. Examination of the mother for characteristic punctate lens opacities can provide an additional clue to the X-linked carrier state.

Ophthalmology – Leukemia / Blood Dyscrasias

Basics

Description

Ocular involvement in leukemia and other blood dyscrasias can occur through several different mechanisms:

• Direct infiltration by malignant leukemic cells
• Secondary hematologic abnormalities, especially anemia and thrombocytopenia
• Hyperviscosity and vascular occlusion
• Opportunistic infection caused by immunosuppression
• Complications of chemotherapy, radiotherapy, or other treatment

Intraocular leukemia refers to direct accumulation of leukemic cells within ocular tissues.

Potential sites include:

• Choroid — most common site of direct infiltration
• Retina
• Optic nerve
• Iris
• Ciliary body
• Vitreous
• Anterior chamber

However, leukemic retinopathy caused by hematologic abnormalities is considerably more common than true leukemic infiltration.

Epidemiology

Ocular abnormalities are relatively common in patients with leukemia, particularly in acute leukemia.

Important points:

• Ocular findings are more common in acute than chronic leukemia.
• Many patients with ocular findings are asymptomatic.
• Adults appear to develop ocular manifestations more frequently than children.
• Retinal hemorrhages are among the most frequent findings.
• Only a minority of ocular lesions represent direct malignant infiltration.

Because ocular disease may be clinically silent, ophthalmic examination can reveal abnormalities even in patients without visual complaints.

Age Considerations

Children

Acute lymphoblastic leukemia (ALL) is the predominant childhood leukemia.

Ocular involvement can result from:

• Leukemic infiltration
• Anemia
• Thrombocytopenia
• Hyperleukocytosis
• Opportunistic infection
• Treatment-related complications

Adults

Acute myeloid leukemia (AML) is the predominant acute leukemia in adults.

Chronic leukemias occur more commonly in older adults and may initially follow a relatively indolent course.

Risk Factors for Leukemia

Important associations and risk factors include:

• Previous chemotherapy
• Previous radiation exposure
• Myelodysplastic syndromes
• Certain genetic disorders, including Down syndrome
• Benzene exposure
• Cigarette smoking
• Family history of leukemia

Pathophysiology of Ocular Disease

There are four major mechanisms.

1. Direct Leukemic Infiltration

Malignant leukocytes directly infiltrate ocular structures.

The choroid is the most commonly infiltrated ocular tissue histopathologically because of its rich vascular supply.

Other sites include:

• Retina
• Optic nerve
• Iris
• Ciliary body
• Vitreous
• Anterior chamber

2. Leukemic Retinopathy

Leukemic retinopathy usually does not represent direct invasion of the retina by malignant cells.

Instead, it commonly results from:

• Anemia
• Thrombocytopenia
• Abnormal coagulation
• Hyperviscosity
• Vascular endothelial injury

This produces retinal hemorrhage and ischemic changes.

3. Hyperviscosity Syndrome

Hyperviscosity results from abnormally increased blood viscosity.

It can occur with:

• Marked leukocytosis in leukemia
• Polycythemia vera
• Waldenström macroglobulinemia
• Multiple myeloma and other monoclonal gammopathies

The resulting sluggish retinal circulation produces a venous stasis retinopathy.

4. Opportunistic Infection

Both leukemia itself and its treatment can produce profound immunosuppression.

Important ocular infections include:

• CMV retinitis
• Herpetic retinal necrosis
• Ocular toxoplasmosis
• Candida and other fungal infections

Distinguishing infection from direct leukemic infiltration can sometimes be difficult but is crucial because treatment is very different.

Diagnosis

History

Patients may be:

• Completely asymptomatic
• Known to have leukemia
• Presenting with ocular manifestations before systemic leukemia has been recognized

Ocular symptoms can include:

• Blurred or decreased vision
• Floaters
• Visual field abnormalities
• Photopsias

Systemic clues include:

• Fever
• Persistent fatigue
• Weight loss
• Recurrent infections
• Easy bruising or bleeding
• Pallor
• Dyspnea
• Lymphadenopathy

These manifestations reflect the major hematologic consequences of leukemia:

• Anemia → pallor, fatigue, dyspnea
• Thrombocytopenia → bleeding
• Abnormal leukocytes → infection and immune dysfunction

Ocular Manifestations

Leukemic Retinopathy

This is considerably more common than direct retinal leukemic infiltration.

Retinal Hemorrhages

Retinal hemorrhage is the most common ocular finding.

Hemorrhages are often:

• Bilateral
• Multifocal

They may occur at different retinal levels:

• Preretinal
• Intraretinal
• Subretinal

Severe hemorrhage can break through into the vitreous.

Roth Spots

Large retinal hemorrhages may contain white centers, producing the classic appearance of Roth spots.

The white centers can represent:

• Fibrin-platelet aggregates
• Ischemic material
• In some cases, leukemic cellular infiltration

Roth spots are not specific for leukemia and occur in several systemic diseases.

Cotton-Wool Spots

Cotton-wool spots may occur because of retinal microvascular ischemia.

They represent focal disruption of axoplasmic flow within the retinal nerve fiber layer.

Direct Retinal Leukemic Infiltration

A characteristic infiltrative lesion can appear as a:

• Fuzzy
• Flat
• White retinal lesion

It may be associated with:

• Retinal hemorrhage
• Overlying vitreous cells

Lesions can be:

• Unifocal or multifocal
• Unilateral or bilateral

Choroidal Infiltration

The choroid is the most common site of direct ocular leukemic infiltration.

Choroidal involvement may be:

• Localized
• Diffuse

It can produce:

• Choroidal thickening
• Retinal pigment epithelial abnormalities
• Serous retinal detachment
• Visual loss

Optic Nerve Infiltration

Leukemia may infiltrate the optic nerve.

Possible findings include:

• Optic disc swelling
• Disc infiltration
• Reduced visual acuity
• Color vision impairment
• Relative afferent pupillary defect when asymmetric
• Visual field defects

Optic nerve infiltration is particularly important because it may represent central nervous system leukemic involvement and requires urgent systemic evaluation.

Anterior Segment Infiltration

Direct leukemic involvement can affect the:

• Iris
• Ciliary body
• Anterior chamber

Possible manifestations include:

• Iris thickening or nodules
• Anterior chamber cells
• Secondary glaucoma
• Hyphema
• Pseudohypopyon

Pseudohypopyon

A leukemic pseudohypopyon represents accumulation of malignant cells in the anterior chamber rather than ordinary inflammatory leukocytes.

It should raise suspicion for direct leukemic infiltration, particularly in a patient with known leukemia.

Vitreous Involvement

Direct infiltration may produce:

• Vitreous cells
• Vitreous haze

However, vitreous inflammation in an immunocompromised patient also raises concern for opportunistic infection.

Hyperviscosity Retinopathy

Typical findings include:

• Dilated and tortuous retinal veins
• Multiple retinal hemorrhages
• Microaneurysms
• Retinal edema
• Intraretinal or subretinal fluid
• Peripheral retinal nonperfusion
• Neovascularization in severe disease

The appearance can resemble a mild central retinal vein occlusion, particularly when bilateral.

Bilateral venous stasis-type retinopathy should prompt consideration of a systemic hyperviscosity disorder.

Chronic Myeloid Leukemia

Patients with chronic myeloid leukemia can develop:

• Peripheral retinal capillary nonperfusion
• Microaneurysms
• Retinal hemorrhage
• Retinal neovascularization

Severe hyperleukocytosis can markedly disturb retinal microcirculation.

Opportunistic Ocular Infections

CMV Retinitis

CMV is an important infectious retinitis in severely immunocompromised patients.

Other Important Infections

Consider:

• Toxoplasmosis
• Candida
• Cryptococcus
• Nocardia
• Herpes-family viral retinitis

Infection can closely mimic malignant infiltration.

Diagnostic Tests

Hematologic Evaluation

When leukemia is suspected, evaluation should be performed together with hematology/oncology.

Investigations can include:

• Complete blood count with differential
• Peripheral blood smear
• Bone marrow aspiration and/or biopsy
• Appropriate systemic staging

Depending on the clinical circumstances, additional testing may include:

• Lumbar puncture with CSF analysis
• Coagulation studies
• Serum protein electrophoresis
• Other tests for hyperviscosity disorders

Ocular Imaging

Depending on the findings, useful studies can include:

• Fundus photography
• Optical coherence tomography (OCT)
• Fluorescein angiography
• B-scan ultrasonography

Fluorescein angiography can help demonstrate:

• Capillary nonperfusion
• Microaneurysms
• Neovascularization
• Vascular leakage

Neuroimaging

If optic nerve infiltration is suspected, obtain appropriate neuroimaging, generally:

• MRI of the orbits
• MRI of the brain

Evaluation for CNS leukemia may also be necessary.

Diagnostic Vitrectomy or Biopsy

When the diagnosis remains uncertain, particularly when distinguishing malignant infiltration from opportunistic infection, diagnostic procedures may include:

• Aqueous sampling
• Vitreous sampling
• Diagnostic pars plana vitrectomy
• Biopsy in selected lesions

Samples can undergo:

• Cytology
• Flow cytometry
• Microbiologic testing
• Molecular testing as appropriate

Differential Diagnosis

Important differentials include:

Infectious

• CMV retinitis
• Candida
• Toxoplasmosis
• Nocardia
• Cryptococcus
• Syphilis
• Other opportunistic infections

Noninfectious

• Primary vitreoretinal lymphoma
• Sarcoidosis
• Intermediate uveitis
• Other causes of retinal hemorrhage
• Central retinal vein occlusion
• Other hyperviscosity syndromes

Treatment

Systemic Leukemia Treatment

The primary treatment is directed at the underlying hematologic malignancy.

Management should be performed by a hematologist/oncologist and may include:

• Systemic chemotherapy
• Targeted therapy
• Immunotherapy
• Hematopoietic stem-cell transplantation

The exact treatment depends on the type and molecular characteristics of the leukemia.

Most secondary ocular manifestations improve when the underlying leukemia and hematologic abnormalities are controlled.

Treatment of Direct Ocular Infiltration

Direct leukemic infiltrates frequently respond to systemic treatment.

If ocular infiltration persists despite adequate systemic therapy, additional treatment may be considered, including:

• Local ocular radiotherapy in selected cases
• Other local or CNS-directed therapy according to the site of involvement and leukemia subtype

Treatment of Leukemic Retinopathy

Treatment is primarily correction of the underlying systemic abnormalities.

This may involve:

• Treatment of leukemia
• Correction of severe anemia
• Management of thrombocytopenia
• Blood product support when clinically indicated

Hemorrhagic retinopathy can improve substantially once the hematologic abnormalities resolve.

Hyperviscosity Syndrome

The underlying hematologic disorder must be treated urgently when hyperviscosity is clinically significant.

Depending on the cause, emergency therapy can include:

• Leukapheresis for selected cases of severe symptomatic hyperleukocytosis
• Plasma exchange for certain paraproteinemias such as Waldenström macroglobulinemia

Definitive systemic therapy is still required.

Retinal Neovascularization

When significant peripheral nonperfusion produces retinal neovascularization, panretinal photocoagulation may be indicated in selected cases.

Opportunistic Infection

Ocular infection requires organism-specific antimicrobial treatment.

This is particularly important because increasing immunosuppression for presumed leukemic infiltration could worsen an unrecognized infection.

Follow-Up

Patients with leukemia require coordinated management between:

• Hematology/oncology
• Ophthalmology

Ophthalmic monitoring should assess:

• Visual acuity
• Anterior segment
• IOP
• Vitreous
• Retina and macula
• Optic nerve

More frequent follow-up is warranted with:

• Direct leukemic infiltration
• Significant retinal hemorrhage
• Hyperviscosity retinopathy
• Optic nerve involvement
• Opportunistic infection

Prognosis

Visual prognosis depends on the mechanism of ocular involvement.

Hemorrhagic leukemic retinopathy may improve substantially when anemia and thrombocytopenia are corrected and the leukemia is controlled.

Direct leukemic infiltration generally indicates more significant systemic disease and has historically been associated with a poorer prognosis.

Ocular findings can therefore provide important information about both visual and systemic disease severity.

Key Clinical Pearls

• Retinal hemorrhage is the most common ocular manifestation of leukemia.
• Most leukemic retinopathy is caused by anemia and thrombocytopenia rather than direct malignant infiltration.
• The choroid is the most common site of direct leukemic ocular infiltration histopathologically.
• White-centered retinal hemorrhages (Roth spots) are suggestive but not specific for leukemia.
• Bilateral venous stasis retinopathy should raise suspicion for hyperviscosity.
• Optic nerve infiltration is an ophthalmic and oncologic concern because it may indicate CNS involvement.
• In an immunocompromised leukemia patient with a new retinal or vitreous lesion, always distinguish leukemic infiltration from opportunistic infection.

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Ophthalmology – Leber Hereditary Optic Neuropathy

Basics

Description

Leber hereditary optic neuropathy (LHON) is a mitochondrial optic neuropathy that causes acute or subacute, painless central visual loss, usually beginning in one eye and then affecting the fellow eye within weeks to months.

The disease is caused by maternally inherited mitochondrial DNA mutations that impair oxidative phosphorylation.

Typical features include:

• Painless central visual loss
• Central or cecocentral scotoma
• Dyschromatopsia
• Sequential involvement of the fellow eye
• Predominance in young adult males

Visual acuity often deteriorates to 20/200 or worse.

Epidemiology

LHON is uncommon.

Reported incidence in European populations is approximately 1 in 30,000 to 1 in 50,000.

The disease most commonly becomes symptomatic between 18 and 35 years of age, although onset can occur in childhood or later adulthood.

Men are affected much more frequently than women.

Risk Factors

The most important risk factor is inheritance of a pathogenic mitochondrial DNA mutation from the mother.

Environmental factors may influence whether a carrier develops visual loss.

Important modifiable risk factors include:

• Smoking
• Heavy alcohol consumption
• Exposure to mitochondrial toxins
• Certain medications with mitochondrial toxicity
• Nutritional deficiency in susceptible individuals

Smoking appears to be particularly important in genetically susceptible carriers.

Genetics

LHON is inherited through mitochondrial DNA, so transmission is maternal.

Affected men do not transmit the mutation to their children.

Affected or carrier women may transmit the mutation to all of their children.

The three major pathogenic mutations are:

• m.3460G>A
• m.11778G>A
• m.14484T>C

Together, these account for the great majority of LHON cases.

The m.11778G>A mutation is the most common.

Penetrance

Not every individual carrying an LHON mutation develops optic neuropathy.

Penetrance is incomplete and strongly influenced by sex.

Men have a substantially greater lifetime risk of visual loss than women.

This means that a family can contain:

• Asymptomatic carriers
• Severely affected individuals
• Individuals with onset at different ages

despite carrying the same mitochondrial mutation.

Heteroplasmy

Some patients have heteroplasmy, meaning both normal and mutant mitochondrial DNA coexist in the same individual.

Others are homoplasmic, meaning essentially all mitochondrial DNA carries the mutation.

The proportion of mutant mitochondrial DNA may influence disease risk, although blood heteroplasmy does not necessarily reflect the exact mitochondrial composition within the optic nerve.

Pathophysiology

The major LHON mutations affect subunits of mitochondrial complex I, also called NADH dehydrogenase.

This impairs oxidative phosphorylation and reduces efficient cellular energy production.

Retinal ganglion cells, particularly those forming the papillomacular bundle, have high metabolic demands and appear especially susceptible.

The result is:

• Retinal ganglion cell dysfunction
• Axonal degeneration
• Optic nerve atrophy
• Permanent central visual loss in many patients

Oxidative stress and free-radical injury also appear to contribute.

General Prevention

In known carriers or affected families, patients should be advised to avoid:

• Smoking
• Heavy alcohol use
• Recreational toxins
• Unnecessary exposure to mitochondrial-toxic medications

A healthy balanced diet is reasonable.

These measures do not guarantee prevention but may reduce environmental stress on vulnerable mitochondria.

Commonly Associated Conditions

Most patients have isolated optic neuropathy.

Rare systemic manifestations can occur, including:

• Cardiac conduction abnormalities
• Wolff-Parkinson-White syndrome
• Other pre-excitation syndromes
• Prolonged QT interval
• Palpitations
• Syncope

Rare neurologic manifestations include:

• Tremor
• Ataxia
• Dystonia
• Hyperreflexia
• Peripheral neuropathy
• Hearing impairment
• Movement disorders
• Nystagmus

A multiple sclerosis-like syndrome associated with LHON is sometimes referred to as LHON-plus.

Diagnosis

History

The classic presentation is:

• Painless visual decline
• Initially involving one eye
• Followed by the fellow eye weeks or months later

Approximately half of patients develop fellow-eye involvement within a few months.

Patients may describe:

• Central blur
• Loss of fine detail
• Difficulty recognizing faces
• Reduced color perception
• Central blind spot

Peripheral vision is often relatively preserved.

Visual Acuity

Visual acuity may initially be mildly reduced but often declines substantially.

Many affected eyes reach:

• 20/200
• Counting fingers
• Occasionally worse

The degree of visual loss varies.

Color Vision

Color vision impairment can occur before major loss of central acuity.

Patients may have:

• Red-green dyschromatopsia
• Generalized color desaturation
• Difficulty with formal color plate testing

Color testing is useful in monitoring optic nerve dysfunction.

Visual Fields

The characteristic defect is a:

• Central scotoma
• Cecocentral scotoma

The defect often enlarges as the disease progresses.

Peripheral visual fields are usually better preserved than central vision.

Fundus Findings

During the acute phase, classic findings may include:

• Circumpapillary telangiectatic microangiopathy
• Peripapillary retinal nerve fiber layer swelling
• Vascular tortuosity
• Hyperemia of the optic disc

Importantly, there is typically little or no leakage from the optic disc on fluorescein angiography, despite the appearance of swelling.

This helps distinguish LHON from true inflammatory optic disc edema.

Pseudoedema

The peripapillary nerve fiber layer may appear swollen, but this is not typical inflammatory disc edema.

Fluorescein angiography generally shows absence of significant disc leakage.

Over time, swelling resolves and is replaced by:

• Temporal pallor
• Diffuse optic atrophy
• Thinning of the retinal nerve fiber layer

Diagnostic Tests

Genetic Testing

Mitochondrial DNA testing is the most important confirmatory test.

Testing should initially include the three major mutations:

• m.3460G>A
• m.11778G>A
• m.14484T>C

Broader mitochondrial sequencing may be considered when clinical suspicion is high but these common mutations are absent.

Optical Coherence Tomography

OCT is useful for documenting structural changes.

Early disease may show:

• Thickening of the retinal nerve fiber layer
• Peripapillary swelling

Later disease shows:

• RNFL thinning
• Ganglion cell complex loss
• Optic atrophy

Ganglion cell loss may become detectable early in the disease course.

Fluorescein Angiography

Fluorescein angiography may demonstrate:

• Peripapillary telangiectatic vessels
• Microangiopathy

A characteristic feature is the absence of significant leakage from the disc.

Visual Evoked Potentials

VEPs may show:

• Reduced amplitude
• Delayed latency
• Absent responses in severe disease

They are supportive but not diagnostic.

Color Testing

More detailed testing may include:

• Farnsworth D-15
• Farnsworth-Munsell 100 Hue test

These can detect optic nerve dysfunction before severe central vision loss.

Cardiac Evaluation

An ECG may be considered because some LHON patients have associated cardiac conduction abnormalities.

This is particularly appropriate if the patient reports:

• Palpitations
• Syncope
• Exercise intolerance

Neuroimaging

MRI of the brain and orbits may be obtained, particularly in atypical cases or when excluding other optic neuropathies.

MRI is often normal or nonspecific.

Imaging is important when the presentation is unusual because LHON can mimic:

• Optic neuritis
• Compressive optic neuropathy
• Demyelinating disease

Differential Diagnosis

Important differential diagnoses include:

• Dominant optic atrophy
• Nutritional optic neuropathy
• Toxic optic neuropathy
• Tobacco-alcohol optic neuropathy
• Multiple sclerosis-associated optic neuritis
• Compressive optic neuropathy
• Wolfram syndrome
• Other inherited mitochondrial optic neuropathies

Dominant Optic Atrophy

Dominant optic atrophy usually presents:

• Earlier in life
• More gradually
• Bilaterally and symmetrically

LHON more typically causes relatively rapid sequential central visual loss.

Optic Neuritis

Typical demyelinating optic neuritis often causes:

• Eye pain with movement
• More acute unilateral loss
• Younger adult presentation
• MRI abnormalities in many cases

LHON is characteristically painless and frequently becomes bilateral sequentially.

Toxic and Nutritional Optic Neuropathy

These may also produce:

• Bilateral central scotomas
• Dyschromatopsia
• Temporal optic pallor

A careful history of:

• Alcohol
• Tobacco
• Medications
• Nutritional status

is essential.

Treatment

Idebenone

Modern management may include idebenone, a synthetic short-chain benzoquinone related to coenzyme Q10.

It is intended to improve mitochondrial electron transport and reduce oxidative stress.

Benefit appears greatest when treatment is started relatively early in the disease course.

Availability and approval vary by country, and management should be coordinated with a neuro-ophthalmologist or mitochondrial disease specialist.

Supportive Metabolic Therapy

Historically, various supplements have been used, including:

• Coenzyme Q10
• Riboflavin
• Thiamine
• Vitamin B12
• Folic acid
• L-carnitine
• Alpha-lipoic acid
• Antioxidants

Evidence for many of these therapies is limited compared with idebenone.

They should not replace specialist-directed treatment.

Gene Therapy

Gene therapy has been studied extensively for LHON, particularly for the m.11778G>A mutation.

Several trials have investigated intravitreal delivery of mitochondrial-targeted genetic constructs.

This remains a rapidly evolving area and availability depends on region and regulatory approval.

Surgery

There is no useful surgical treatment for the underlying mitochondrial optic neuropathy.

Procedures such as optic nerve sheath decompression do not improve LHON.

Referral

Patients with suspected LHON should be referred to a:

• Neuro-ophthalmologist
• Medical geneticist or genetic counselor
• Mitochondrial disease specialist when appropriate

Cardiology referral may be indicated if conduction abnormalities are suspected.

Low-Vision Rehabilitation

Because central vision may be severely affected while peripheral vision remains relatively intact, low-vision services are extremely important.

Useful interventions may include:

• Magnifiers
• Electronic reading devices
• Screen magnification
• Text-to-speech software
• High-contrast aids
• Orientation and mobility training

Visual rehabilitation can substantially improve independence.

Genetic Counseling

Genetic counseling is essential.

Important inheritance principles include:

• Transmission is maternal.
• An affected father does not transmit LHON mtDNA to his children.
• A carrier mother can transmit the mutation to both sons and daughters.
• Not every carrier develops visual loss.
• Men are more likely to become affected than women.

Female relatives are especially important to identify because they can transmit the mutation to future generations.

Follow-Up

Patients should be monitored with:

• Visual acuity
• Color vision
• Visual fields
• OCT
• Fundus examination

During the acute phase, relatively frequent follow-up may help document progression from one eye to the other and monitor structural changes.

Patient Education

Patients should be advised to:

• Stop smoking
• Avoid heavy alcohol consumption
• Maintain good nutrition
• Avoid unnecessary mitochondrial-toxic exposures
• Inform physicians of the mitochondrial diagnosis before starting new medications
• Seek genetic counseling
• Use low-vision rehabilitation early if needed

Family members may benefit from genetic testing after appropriate counseling.

Prognosis

The prognosis varies considerably according to the mitochondrial mutation.

m.11778G>A

This mutation generally has the poorest spontaneous visual recovery.

m.14484T>C

This mutation has a significantly better chance of partial spontaneous recovery.

m.3460G>A

The prognosis is generally intermediate.

Better recovery has also been associated with:

• Younger age at onset
• Larger optic disc size in some studies
• Earlier treatment
• Certain mitochondrial genetic backgrounds

Visual Recovery

When recovery occurs, patients may notice:

• Small islands of clearer vision within the central scotoma
• Gradual improvement in central acuity
• Better color perception

Recovery can occur months or even years after onset.

However, many patients are left with significant permanent central visual impairment.

Complications

The principal complication is permanent bilateral central visual loss.

Secondary consequences may include:

• Loss of driving ability
• Difficulty reading
• Occupational limitations
• Reduced independence
• Psychosocial distress

Rare systemic complications include cardiac conduction abnormalities and neurologic manifestations.

The key clinical pearl is: LHON should be suspected in a young adult—especially a man—with painless, severe central visual loss in one eye followed weeks to months later by similar involvement of the fellow eye, particularly when maternal male relatives have experienced comparable visual loss.

Ophthalmology – Lattice Degeneration

Basics

Description

Lattice degeneration is a common peripheral retinal degeneration characterized by areas of retinal thinning with abnormal vitreoretinal adhesion along their borders.

It is important because affected areas may develop:

• Atrophic retinal holes
• Retinal tears
• Rhegmatogenous retinal detachment

Despite this association, most people with lattice degeneration never develop a retinal detachment.

Epidemiology

Lattice degeneration is found in approximately 6–10% of the general population.

It is more common in:

• Myopic eyes
• Patients with a family history of retinal detachment
• Certain hereditary vitreoretinal disorders

Lattice degeneration is present in a substantial proportion of eyes that develop retinal detachment, but its presence alone does not mean that detachment will occur.

Risk Factors

Important risk factors include:

• Myopia
• Family history of lattice degeneration or retinal detachment
• Previous retinal tear or detachment in the fellow eye
• Stickler syndrome
• Wagner syndrome
• Other hereditary vitreoretinal disorders

High axial myopia is particularly associated with peripheral retinal degenerative changes.

General Prevention

There is no known method to prevent lattice degeneration from developing.

Management therefore focuses on:

• Identifying high-risk patients
• Recognizing associated retinal tears
• Educating patients about retinal detachment symptoms
• Treating significant retinal breaks when indicated

Pathophysiology

The affected peripheral retina undergoes inner retinal thinning and atrophy.

Overlying the lattice lesion, the vitreous tends to become liquefied.

At the edges of the lesion, however, the vitreous remains more firmly attached to the retina.

This combination creates:

• Thin retina within the lesion
• Liquefied vitreous over the lesion
• Strong vitreoretinal adhesion at its margins

When the posterior vitreous separates, traction at these firmly adherent borders can produce a retinal tear.

Atrophic holes can also develop directly within the thinned retina.

Etiology

The precise cause is unknown.

A genetic predisposition is likely, particularly because lattice degeneration is more common in families with:

• Retinal detachment
• High myopia
• Hereditary vitreoretinal disease

Commonly Associated Conditions

Important associations include:

• Axial myopia
• Atrophic retinal holes
• Peripheral chorioretinal atrophy
• Retinal tears
• Posterior vitreous detachment
• Stickler syndrome
• Wagner syndrome

Diagnosis

History

Most lattice degeneration is discovered incidentally during a dilated retinal examination.

Patients may be completely asymptomatic.

When symptoms occur, they are usually related to an associated posterior vitreous detachment or retinal tear rather than the lattice itself.

Important symptoms include:

• New flashes of light
• New floaters
• Sudden increase in floaters
• A curtain or shadow in the visual field
• Peripheral visual field loss
• Sudden decrease in vision

History should also include:

• Previous retinal tear
• Previous retinal detachment
• Retinal detachment in the fellow eye
• Family history of retinal detachment
• Degree of myopia

Patients who have previously undergone refractive surgery or cataract surgery may no longer appear highly myopic by refraction, so a history of preoperative myopia should specifically be obtained.

Physical Examination

A complete dilated retinal examination is required.

The vitreous should first be examined for evidence of acute posterior vitreous separation or retinal tearing.

Vitreous Pigment

Pigment cells dispersed within the anterior vitreous may suggest the presence of a retinal tear.

This finding is sometimes referred to clinically as Shafer sign or “tobacco dust.”

When present in a symptomatic patient, a careful search for a retinal break is essential.

Posterior Vitreous Detachment

The examiner should determine whether a posterior vitreous detachment is present.

Acute PVD can generate traction at the edges of lattice degeneration and increase the risk of a horseshoe retinal tear.

Appearance of Lattice Degeneration

Lattice typically appears as elongated or oval peripheral retinal lesions.

Common features include:

• Linear orientation
• Location anterior to the equator
• Orientation roughly parallel to the ora serrata
• Retinal thinning
• Pigmentary changes
• White vascular sclerosis
• Branching white lines
• Small atrophic holes

The appearance can vary considerably from one patient to another.

Retinal Thinning

The retina within the lattice area may appear:

• Thin
• Gray
• Translucent
• Atrophic

The edges may be more heavily pigmented.

White Lines

Branching white lines may cross the lesion.

These represent sclerosed retinal vessels and contribute to the classic lattice-like appearance.

Atrophic Holes

Small round holes may develop within areas of lattice degeneration.

These are usually caused by progressive thinning rather than acute vitreous traction.

Most asymptomatic atrophic holes associated with lattice do not require treatment.

Peripheral Retinal Examination

A careful peripheral examination, often with scleral depression, is important to identify:

• Horseshoe tears
• Atrophic holes
• Small retinal detachments
• Other areas of lattice

The examination should encompass the full retinal periphery.

Differential Diagnosis

Important differential diagnoses include:

• Cobblestone degeneration
• Peripheral retinoschisis
• Microcystoid degeneration
• Chorioretinal scar
• Previous retinal laser scars
• Chronic retinal detachment
• Hereditary vitreoretinal degeneration

Cobblestone Degeneration

Cobblestone or paving-stone degeneration consists of areas of peripheral chorioretinal atrophy.

Unlike lattice degeneration, it generally does not carry the same association with retinal tearing and detachment.

Peripheral Retinoschisis

Degenerative retinoschisis represents splitting of the retinal layers.

It may mimic peripheral retinal elevation or degeneration but differs from lattice in morphology and pathophysiology.

Stickler Syndrome

Stickler syndrome is an important inherited vitreoretinal disorder associated with a high risk of retinal detachment.

Features may include:

• High myopia
• Abnormal vitreous
• Lattice-like retinal degeneration
• Cataract
• Midface hypoplasia
• Small chin
• Cleft palate or bifid uvula
• Hearing abnormalities

Common genetic causes include mutations involving COL2A1 and COL11A1.

Treatment

Asymptomatic Lattice Degeneration

Most asymptomatic lattice degeneration requires observation only.

Routine prophylactic laser treatment is generally not indicated solely because lattice is present.

This remains true for many cases in which small atrophic holes are found within the lattice but there is:

• No progressive subretinal fluid
• No associated symptomatic tear
• No retinal detachment

Symptomatic Patients

A patient with new flashes or floaters requires a careful dilated retinal examination because symptoms may indicate:

• Acute PVD
• Retinal tear
• Early retinal detachment

The presence of symptoms does not automatically mean the lattice itself should be lasered.

Treatment is directed primarily at clinically significant retinal breaks or other high-risk findings.

Retinal Tears

A symptomatic tractional retinal tear is generally treated with:

• Laser retinopexy
• Cryoretinopexy in selected cases

The goal is to create a chorioretinal adhesion around the tear and reduce progression to retinal detachment.

Prophylactic Laser for Lattice

Prophylactic treatment may be considered selectively in patients with particularly high-risk circumstances, such as:

• Retinal detachment in the fellow eye
• Certain hereditary vitreoretinopathies
• High-risk retinal breaks within lattice
• Progressive subretinal fluid
• Other special circumstances determined by a retina specialist

Routine treatment of all lattice degeneration is not recommended.

Retinal Detachment

If a retinal detachment develops, treatment depends on:

• Location
• Extent
• Type of retinal break
• Lens status
• Vitreous anatomy

Possible procedures include:

• Pneumatic retinopexy
• Scleral buckle
• Pars plana vitrectomy
• Combination surgery

Referral

Referral to a retina specialist is appropriate when there is:

• Symptomatic retinal tear
• Retinal detachment
• Suspicious peripheral retinal break
• Progressive subretinal fluid
• Significant high-risk fellow-eye history
• Hereditary vitreoretinal disease

Follow-Up

Follow-up intervals depend on:

• Extent of lattice degeneration
• Presence of retinal holes
• Symptoms
• Degree of myopia
• Fellow-eye history
• Family history
• Presence of PVD

Patients with high myopia or previous retinal detachment in the fellow eye may warrant closer surveillance.

Patient Education

Patient education is extremely important.

Patients should seek urgent ophthalmic assessment if they develop:

• New flashes
• Sudden onset of multiple floaters
• A shower of black dots
• A curtain or veil in the vision
• New peripheral field loss
• Sudden decrease in visual acuity

These symptoms may represent a retinal tear or detachment.

Prognosis

The overall prognosis for isolated lattice degeneration is excellent.

Most patients never develop retinal detachment.

The absolute risk of detachment in an eye with lattice but without prior detachment in the fellow eye is relatively low.

The prognosis changes substantially if a retinal tear or detachment develops.

Complications

The major complications are:

• Atrophic retinal holes
• Horseshoe retinal tears
• Rhegmatogenous retinal detachment
• Permanent visual loss if retinal detachment involves the macula or treatment is delayed

The key clinical pearl is: lattice degeneration itself is usually observed, but new flashes, floaters, or a visual-field curtain require urgent retinal examination because these symptoms may indicate a retinal tear or detachment.

Ophthalmology – Lattice Corneal Dystrophy

Basics

Description

Lattice corneal dystrophy (LCD) is a bilateral, noninflammatory stromal corneal dystrophy characterized by deposition of amyloid within the corneal stroma. These deposits form fine, refractile, branching lines that resemble a lattice.

The major recognized forms are lattice corneal dystrophy type I and lattice corneal dystrophy type II.

Type I, also called classic lattice dystrophy or Biber-Haab-Dimmer dystrophy, is usually an autosomal dominant corneal dystrophy associated with recurrent corneal erosions and progressive visual impairment.

Type II, also called Meretoja syndrome or Finnish familial amyloidosis, produces similar corneal lattice changes but is associated with systemic amyloidosis and neuropathy.

Lattice Corneal Dystrophy Type I

Type I usually begins in the first decade of life.

Amyloid deposits develop within the central corneal stroma and gradually form branching lattice lines.

The lattice lines generally begin centrally and extend peripherally but typically do not reach the limbus.

Clinical manifestations include:

• Recurrent corneal erosions
• Eye pain
• Foreign-body sensation
• Photophobia
• Tearing
• Progressive corneal scarring
• Reduced best-corrected visual acuity

Visual impairment often becomes significant by adulthood.

Lattice Corneal Dystrophy Type II

Type II generally becomes symptomatic later, often in the third or fourth decade.

The corneal lattice lines tend to begin more peripherally and extend centrally.

Recurrent erosions may be less prominent than in type I, but reduced corneal sensation and neurotrophic epithelial problems can occur.

Unlike type I, type II is part of a systemic amyloidosis and may be associated with:

• Cranial neuropathies
• Facial weakness or drooping
• Peripheral neuropathy
• Carpal tunnel syndrome
• Autonomic dysfunction
• Cardiac arrhythmias

Epidemiology

Lattice dystrophy is among the more common stromal corneal dystrophies, although it remains relatively uncommon in the general population.

Most cases of classic LCD are inherited in an autosomal dominant fashion.

Rare autosomal recessive variants have also been described.

Risk Factors

The major risk factor is a family history of lattice corneal dystrophy.

A patient may still develop the disease without a known family history because spontaneous pathogenic variants can occur.

A family history of systemic amyloidosis is particularly important in suspected type II disease.

Genetics

Type I

Classic lattice corneal dystrophy is associated with mutations in the TGFBI gene on chromosome 5q31.

TGFBI mutations are also involved in several other stromal corneal dystrophies.

Type II

Type II is caused by mutations in the gelsolin gene on chromosome 9q34.

The mutation causes systemic amyloid deposition in addition to corneal disease.

General Prevention

There is no way to prevent the inherited disorder itself.

Genetic counseling may be useful for affected families.

Early recognition and treatment of recurrent erosions may reduce pain, infection risk, and secondary scarring.

Pathophysiology

Amyloid accumulates within the corneal stroma.

Initially, the deposits may appear as faint opacities. Over time, they develop into:

• Refractile branching lines
• Stromal haze
• Scar formation

When amyloid deposits extend toward the anterior cornea, they interfere with epithelial adhesion.

This leads to recurrent corneal erosions.

Repeated epithelial breakdown and healing eventually produce anterior stromal scarring and irregularity, which can reduce vision.

Associated Conditions

Type I

Classic LCD generally has no important systemic association.

Type II

Type II is part of systemic gelsolin amyloidosis.

Associated manifestations may include:

• Facial nerve dysfunction
• Facial drooping
• Reduced corneal sensation
• Peripheral neuropathy
• Carpal tunnel syndrome
• Autonomic dysfunction
• Orthostatic symptoms
• Cardiac rhythm abnormalities

Because of these systemic features, coordination with primary care and other specialists is important.

Diagnosis

History

Younger patients commonly present with symptoms of recurrent corneal erosion.

These include:

• Sudden foreign-body sensation
• Sharp eye pain
• Tearing
• Photophobia
• Blurred vision

Symptoms may occur in one or both eyes.

Erosions are often particularly noticeable on awakening because the eyelid may adhere to poorly attached epithelium during sleep.

Older patients may additionally report gradually worsening visual acuity from stromal scarring and irregular astigmatism.

Physical Examination

Early Disease

Slit-lamp examination may reveal:

• Fine subepithelial or anterior stromal opacities
• Faint refractile deposits near the central cornea

These findings may be subtle in young children.

Lattice Lines

As the disease progresses, characteristic:

• Thin
• Refractile
• Branching
• Interconnecting

stromal lines become visible.

They produce the classic lattice-like appearance.

In type I, these are predominantly central and usually spare the limbal region.

In type II, they may begin more peripherally and extend centrally.

Corneal Scarring

Repeated erosions can produce:

• Anterior stromal haze
• Irregular corneal surface
• Dense central scarring

This is a major cause of reduced best-corrected vision in advanced disease.

Corneal Sensation

Corneal sensation may be reduced.

This is particularly important in type II, where cranial neuropathy and neurotrophic corneal disease can lead to persistent epithelial defects.

Reduced sensation can also make corneal injuries less symptomatic despite significant epithelial damage.

Diagnostic Tests

The diagnosis is primarily clinical, based on slit-lamp findings and family history.

In atypical cases, genetic testing can be useful.

Pathological Findings

Histopathology demonstrates amyloid deposition in the corneal stroma.

Amyloid stains positively with Congo red.

Under polarized light, Congo red-stained amyloid demonstrates characteristic apple-green birefringence.

These findings confirm the amyloid nature of the deposits.

Differential Diagnosis

Important differential diagnoses include:

• Recurrent corneal erosion syndrome
• Granular corneal dystrophy
• Macular corneal dystrophy
• Amyloid corneal degeneration
• Other TGFBI-associated dystrophies

A key distinction is that lattice dystrophy shows branching amyloid lines, whereas granular dystrophy typically produces discrete crumb-like stromal deposits.

Treatment

Treatment depends on whether the main problem is:

• Recurrent erosions
• Corneal scarring
• Reduced vision
• Neurotrophic epithelial disease

Treatment of Recurrent Corneal Erosions

Lubrication

Frequent preservative-free artificial tears can reduce epithelial friction.

Lubricating ointment is particularly useful at bedtime.

Hypertonic Saline

Hypertonic sodium chloride drops or ointment may improve epithelial adhesion by reducing epithelial edema.

They are often used:

• During recurrent erosion episodes
• At bedtime for prevention

Topical Antibiotics

When an epithelial defect is present, a topical antibiotic may be used to reduce the risk of infectious keratitis.

A fluoroquinolone is commonly chosen for significant epithelial defects.

Antibiotics are not required continuously once the epithelium has healed.

Cycloplegics

Cycloplegic medication can reduce:

• Ciliary spasm
• Pain
• Photophobia

during significant acute erosion episodes.

Bandage Contact Lens

A bandage contact lens may:

• Reduce pain
• Protect regenerating epithelium
• Facilitate healing

Because an epithelial defect and contact lens together increase the risk of microbial keratitis, antibiotic prophylaxis and close follow-up are essential.

Epithelial Debridement

Loose or nonadherent epithelium may be removed to create a healthier surface for re-epithelialization.

This is particularly useful when recurrent erosions persist despite conservative treatment.

Superficial Keratectomy

For recurrent erosions with superficial scarring, superficial keratectomy may remove abnormal epithelium and anterior stromal deposits.

A diamond burr may be used to polish the underlying Bowman layer and reduce recurrence.

Phototherapeutic Keratectomy

Phototherapeutic keratectomy (PTK) can be useful when deposits and scars remain relatively superficial.

PTK can:

• Remove superficial amyloid
• Smooth the anterior corneal surface
• Improve visual acuity
• Reduce recurrent erosions

Recurrence remains possible because the genetic defect persists.

Corneal Transplantation

When stromal opacification is too deep for PTK and vision is significantly impaired, corneal transplantation may be required.

Options include:

• Deep anterior lamellar keratoplasty
• Penetrating keratoplasty

The choice depends on the depth of the disease and corneal anatomy.

Recurrence After Transplantation

Lattice dystrophy can recur in the donor cornea because abnormal amyloid-producing cells remain in the recipient tissue.

Recurrence may occur years after transplantation and can again affect visual acuity.

Delayed Epithelial Healing

Patients with lattice dystrophy may heal more slowly after corneal procedures.

Careful postoperative epithelial monitoring is therefore important.

Management of Type II

Patients with LCD II require both ophthalmic and systemic care.

Because systemic amyloidosis can cause:

• Neuropathy
• Autonomic abnormalities
• Cardiac disease

communication with primary care, neurology, and cardiology may be necessary.

Neurotrophic corneal disease may require more aggressive surface protection than classic LCD.

Referral

Referral to a corneal specialist is appropriate when:

• Erosions become frequent
• Epithelial defects persist
• Vision progressively decreases
• Corneal scarring becomes significant
• PTK or transplantation is being considered

Patients suspected of type II disease should also undergo appropriate systemic evaluation.

Follow-Up

Follow-up frequency depends on severity.

Patients with mild stable disease may be examined periodically.

More frequent review is required for:

• Active erosion
• Persistent epithelial defect
• Bandage contact lens use
• Postoperative care
• Progressive scarring

Patients who undergo transplantation require lifelong follow-up.

Monitoring After Corneal Transplantation

Patients treated with prolonged topical corticosteroids should be monitored for:

• Elevated intraocular pressure
• Steroid-induced glaucoma
• Cataract progression
• Graft rejection
• Infectious keratitis

Patient Education

Patients should understand that lattice dystrophy is:

• Genetic
• Bilateral
• Chronic
• Recurrent

There is currently no treatment that eliminates the underlying genetic defect.

However, recurrent erosions and visual impairment can usually be managed effectively.

Patients should seek urgent ophthalmic assessment for:

• Increasing pain
• Redness
• Photophobia
• Discharge
• Sudden decline in vision

because an epithelial erosion can occasionally become infected.

Prognosis

Type I

The prognosis for maintaining useful vision is generally good with proper treatment.

However, many patients eventually require procedures such as:

• PTK
• Superficial keratectomy
• Corneal transplantation

as recurrent erosions and stromal scarring accumulate.

Systemic health and lifespan are generally normal.

Type II

Patients are often less severely affected by recurrent erosions but have greater concern for systemic amyloidosis and neuropathy.

The overall prognosis therefore depends more heavily on systemic involvement.

Complications

Important complications include:

• Recurrent corneal erosions
• Corneal scarring
• Irregular astigmatism
• Reduced visual acuity
• Persistent epithelial defects
• Neurotrophic keratopathy
• Infectious keratitis
• Recurrence after corneal transplantation
• Corneal graft rejection
• Steroid-induced ocular hypertension or glaucoma

The key clinical pearl is: lattice corneal dystrophy is an inherited stromal amyloidosis characterized by refractile branching corneal lines; type I primarily causes recurrent erosions and scarring, whereas type II should prompt evaluation for systemic gelsolin amyloidosis and neuropathy.

Ophthalmology – Lagophthalmos & Lid Retraction Basics Description Lagophthalmos means incomplete eyelid closure. Lid retraction refers to abnormal elevation of the upper eyelid or depression of the lower eyelid so that sclera is visible above the superior limbus or below the inferior limbus when the patient is looking straight ahead with the brows relaxed and the head in a normal position. Both conditions can lead to exposure of the ocular surface, resulting in irritation, tearing, superficial punctate keratopathy, corneal ulceration, scarring, and, in severe cases, visual loss.

Epidemiology The incidence depends on the underlying cause. Lid retraction is the most common eyelid sign of thyroid eye disease. Lagophthalmos is also commonly encountered in: Facial nerve palsy Postoperative eyelid abnormalities Cicatricial eyelid disease Proptosis Severe ectropion

Risk Factors Risk factors depend on the cause and include: Thyroid eye disease Facial nerve palsy Previous eyelid or orbital surgery Prior trauma Chemical burns Cicatrizing conjunctival disorders Proptosis Aging-related eyelid laxity Previous aggressive blepharoplasty

General Prevention Some postoperative cases can be prevented with careful surgical technique. Important preventive measures include: Avoiding excessive skin removal during blepharoplasty Proper reconstruction of the lateral canthal tendon after canthotomy or cantholysis Appropriate use of postoperative traction sutures when indicated Avoiding excessive scarring or shortening of the eyelid lamellae Careful management of extraocular muscle surgery in thyroid eye disease Early treatment of ocular surface exposure also helps prevent corneal complications.

Pathophysiology of Lagophthalmos Normal eyelid closure depends on proper eyelid anatomy, globe position, and functioning of the orbicularis oculi muscle, which is supplied by cranial nerve VII. Lagophthalmos may occur when the eyelids are unable to cover the globe because of several mechanisms.

Proptosis If the globe protrudes excessively, normal eyelids may no longer be able to close fully over the cornea. Causes include: Thyroid eye disease Orbital tumor Retrobulbar hemorrhage Orbital inflammation Naturally shallow orbits

Anterior Lamellar Shortening The anterior eyelid lamella consists primarily of skin and orbicularis muscle. Scarring or tissue loss can shorten this layer and prevent eyelid closure. Causes include: Previous eyelid surgery Excessive blepharoplasty Trauma Herpes zoster scarring Tumor excision Burns

Posterior Lamellar Scarring The posterior lamella includes the tarsus and conjunctiva. Cicatrization can shorten the inner eyelid and restrict movement. Causes include: Ocular cicatricial pemphigoid Chemical injury Trachoma Severe conjunctival inflammation

Neurogenic Lagophthalmos The orbicularis oculi closes the eyelid and is innervated by cranial nerve VII. Facial nerve palsy can therefore cause: Poor blink Incomplete closure Lower lid laxity Ectropion Exposure keratopathy

Pathophysiology of Lid Retraction Lid retraction is present even when the eye is at rest in primary gaze. It may result from: Overactivity or fibrosis of eyelid retractors Proptosis Scarring Mechanical traction Thyroid eye disease Previous eyelid or orbital surgery Upper eyelid retraction is especially characteristic of thyroid eye disease. Lower eyelid retraction may coexist with significant ectropion.

Etiology Major causes include: Autoimmune Thyroid eye disease Ocular cicatricial pemphigoid Inflammatory or Cicatricial Postoperative scarring Trachoma Leprosy Chemical burns Neurogenic Facial nerve palsy Mechanical Proptosis Shallow orbit Eyelid tumor Scar contracture Involutional Age-related lower eyelid laxity Ectropion

Commonly Associated Conditions Important associated disorders include: Thyroid eye disease Facial nerve palsy Ectropion Previous eyelid surgery Orbital tumors Cicatrizing conjunctival disease

Diagnosis History Important questions include: When did the eyelid abnormality begin? Is it worsening? Is there tearing? Foreign-body sensation? Burning or gritty sensation? Photophobia? Eye pain? Reduced vision? Diplopia? Pain with eye movement? Previous eyelid or facial surgery? Previous trauma? History of facial herpes zoster? Chronic topical eye medication use? Chemical injury? Thyroid disease? Facial weakness? History often helps identify whether the problem is mechanical, neurologic, inflammatory, or postoperative.

Physical Examination A complete eyelid, orbital, and ocular examination is required.

Eyelid Position For lid retraction, assess the eyelids in primary gaze with: Head straight Brows relaxed No voluntary eyelid elevation Scleral show above or below the limbus supports lid retraction.

Eyelid Closure To assess lagophthalmos, the patient should be asked to gently close the eyes normally, rather than squeeze forcefully. Any residual gap between the upper and lower eyelids should be measured. Forced closure may appear normal even when spontaneous or gentle closure is inadequate.

Blink Function Observe: Frequency of spontaneous blinking Completeness of blink Orbicularis strength Bell phenomenon Reduced blink function substantially increases the risk of exposure keratopathy.

Tarsal Conjunctiva Evert the eyelids and look for: Conjunctival scarring Foreshortening Symblepharon Signs of ocular cicatricial pemphigoid

Facial Nerve Examination Look for: Facial asymmetry Poor forehead movement Weak eyelid closure Drooping mouth Reduced orbicularis strength These findings suggest cranial nerve VII dysfunction.

Proptosis Assessment Hertel exophthalmometry can quantify proptosis. Proptosis suggests an orbital cause such as: Thyroid eye disease Tumor Inflammation Hemorrhage

Ocular Motility Assess: Extraocular movements Alignment Diplopia Restriction may suggest thyroid eye disease or an orbital mass.

Pupillary Examination Check for: Relative afferent pupillary defect Abnormal pupillary responses An RAPD may indicate optic nerve involvement from severe thyroid orbitopathy or an orbital mass.

Corneal Examination This is one of the most important parts of the examination. Look for: Superficial punctate epithelial erosions Inferior exposure staining Corneal epithelial defects Ulceration Stromal thinning Scarring Infection Fluorescein staining helps define the extent of exposure damage.

Anterior Segment Examination Also assess for: Iris atrophy Uveitis Corneal edema Secondary inflammation

Fundus Examination Fundoscopy is important when orbital disease is suspected. Possible findings include: Choroidal folds Optic disc edema Optic atrophy These findings may indicate orbital compression or mass effect.

Diagnostic Tests and Interpretation Thyroid Testing If thyroid eye disease is suspected, testing may include: TSH Free T4 T3 Thyroid-stimulating immunoglobulins or related thyroid antibodies

Conjunctival Biopsy If ocular cicatricial pemphigoid is suspected, conjunctival biopsy may be performed for direct immunofluorescence. Typical findings may include deposition of immunoglobulins and complement along the basement membrane zone.

Orbital Imaging CT or MRI of the orbits may be indicated when evaluating for: Thyroid eye disease Orbital mass Proptosis Extraocular muscle enlargement Orbital inflammation In thyroid eye disease, enlargement of extraocular muscle bellies with relative tendon sparing may be seen.

Brain and Facial Nerve Imaging MRI or other neurologic imaging may be required when investigating unexplained facial nerve palsy. The exact imaging depends on the suspected location and cause of the lesion.

Visual Field Testing Visual fields may be useful when optic neuropathy is suspected. Defects can occur in: Severe thyroid eye disease Orbital tumors Compressive lesions

Color Vision Reduced color discrimination may be an early sign of compressive optic neuropathy.

External Photography Clinical photographs are useful for: Documenting eyelid position Monitoring progression Comparing with old photographs Distinguishing acquired disease from a longstanding normal variant

Differential Diagnosis The differential depends on the suspected mechanism. Important possibilities include: Thyroid eye disease Orbital tumor Shallow orbits Facial nerve palsy Cicatricial eyelid disease Postoperative scarring Ectropion Ocular cicatricial pemphigoid Chemical injury Apparent lower lid retraction can occasionally result from chronic abnormal head posture rather than true eyelid disease.

Treatment Treatment has two major goals: Protect the cornea Correct the underlying eyelid or orbital abnormality

Observation If the patient is asymptomatic and the cornea remains healthy, observation may be appropriate. Periodic examination is still required because exposure can worsen.

Lubrication First-line therapy for exposure usually includes: Frequent preservative-free artificial tears Lubricating gels Ointment at bedtime More severe exposure requires more frequent lubrication.

Nighttime Protection Patients with nocturnal lagophthalmos may benefit from: Taping the eyelids closed Moisture chamber goggles Protective eye shields The lids should be closed carefully without exerting pressure on the globe.

Environmental Measures Patients should avoid excessive ocular surface drying. Helpful measures include: Directing fans away from the face Avoiding strong air-conditioning drafts Using a room humidifier Avoiding unnecessary prolonged exposure to dry environments

Treatment of Associated Conditions Other ocular surface problems should also be treated, including: Blepharitis Allergic conjunctivitis Dry eye Meibomian gland dysfunction Underlying systemic conditions such as thyroid eye disease or ocular cicatricial pemphigoid require specific treatment.

Surgical Treatment Surgery is considered when conservative therapy does not adequately protect the cornea or when eyelid malposition is significant. The procedure depends on the mechanism.

Tarsorrhaphy A temporary or permanent tarsorrhaphy partially joins the upper and lower eyelids. It can be very effective for severe exposure. It may be used in: Facial nerve palsy Neurotrophic cornea Severe lagophthalmos Persistent epithelial defects

Upper Eyelid Retraction Surgery Upper eyelid retractors may be recessed. Structures that may be weakened include: Müller muscle Levator palpebrae superioris The procedure may be performed through a skin or conjunctival approach.

Upper Eyelid Weight Implant For facial nerve palsy, a gold or platinum weight can be implanted into the upper eyelid. Gravity helps bring the lid downward when the patient attempts to close the eye. Platinum weights are often thinner for a given weight than gold implants.

Eyelid Springs Mechanical eyelid springs may occasionally be used in selected facial paralysis cases.

Lower Eyelid Retraction Surgery Options include: Lower lid retractor recession Lateral canthal tightening Spacer graft placement Midface elevation in selected cases Spacer materials may include: Buccal mucosa Acellular dermal matrix Other graft tissues

Skin Grafting Anterior lamellar deficiency may require a full-thickness skin graft. This is particularly relevant after: Excessive blepharoplasty Trauma Tumor removal Cicatricial shortening

Ectropion Repair Paralytic or involutional lower lid ectropion may require: Horizontal shortening Lateral tarsal strip Canthoplasty Improving lower eyelid position helps restore the tear reservoir and protect the cornea.

Management of Facial Nerve Palsy The urgency of surgical intervention depends partly on whether facial nerve recovery is expected. If recovery is likely, temporary measures may be preferred. If permanent weakness is expected, definitive correction of: Lagophthalmos Upper lid retraction Lower lid ectropion may be necessary.

Follow-Up Follow-up depends primarily on the severity of corneal exposure. Severe disease may require: Daily review Very frequent outpatient monitoring Occasionally inpatient management Mild stable disease may only require periodic or annual review.

Referral Depending on the cause, appropriate specialists may include: Oculoplastic surgeon Corneal specialist Endocrinologist Primary care physician Neurologist ENT specialist Neurosurgeon

Patient Education Patients should understand that the main risk is corneal exposure. They should seek urgent review for: Increasing pain Sudden decrease in vision Increased redness Severe photophobia Corneal opacity Increasing discharge Regular lubrication and nighttime protection should be emphasized when recommended.

Prognosis The prognosis depends on: Underlying cause Severity of eyelid dysfunction Degree of corneal exposure Corneal sensation Response to treatment Mild cases may remain stable with lubrication alone. Severe untreated exposure can progress to: Persistent epithelial defect Infectious keratitis Corneal ulceration Thinning Perforation Permanent visual loss

Complications Important complications include: Exposure keratopathy Corneal abrasion Corneal ulceration Infectious keratitis Corneal scarring Corneal perforation Visual loss Chronic tearing Cosmetic disfigurement The key clinical pearl is: lagophthalmos is diagnosed by incomplete gentle eyelid closure, while lid retraction is diagnosed by scleral show in primary gaze; in both conditions, the immediate priority is protection of the corneal surface.

Ophthalmology – Lacrimal Gland Tumors

Basics

Description

Lacrimal gland tumors and masses comprise a broad group of disorders involving the lacrimal gland in the superotemporal orbit. They may be:

• Epithelial or nonepithelial
• Benign or malignant
• Inflammatory or neoplastic
• Primary or metastatic

Only a minority of orbital lesions arise from the lacrimal gland, and most lacrimal gland enlargements are nonepithelial, particularly inflammatory or lymphoid disorders.

Important categories include:

• Inflammatory dacryoadenitis
• Idiopathic orbital inflammatory disease
• Sarcoidosis
• Lymphoid tumors
• Dacryops
• Pleomorphic adenoma
• Adenoid cystic carcinoma
• Other epithelial malignancies
• Metastatic disease

The clinical behavior varies widely, so the tempo of growth, presence of pain, globe displacement, imaging characteristics, and bone involvement are particularly important.

Epidemiology

Approximately 10% of orbital lesions involve the lacrimal gland.

Most lacrimal gland lesions are nonepithelial. Important nonepithelial causes include:

• Inflammatory disease
• Lymphoma
• Reactive lymphoid hyperplasia
• Sarcoidosis

Among epithelial tumors, benign lesions include pleomorphic adenoma and ductal cysts such as dacryops, while adenoid cystic carcinoma is one of the most important malignant epithelial tumors.

Adenoid Cystic Carcinoma

Adenoid cystic carcinoma can occur at almost any age but most often presents in adulthood.

It is notable for:

• Relatively rapid progression
• Pain
• Bone destruction
• Perineural invasion
• Local recurrence
• Potential intracranial and systemic spread

Pain is an especially important warning sign because perineural invasion is characteristic.

Dacryops

A dacryops is a ductal cyst involving the lacrimal gland, often the palpebral lobe.

It is usually:

• Benign
• Slowly growing
• Painless
• Occasionally visible beneath the superior temporal conjunctiva

Many require no treatment unless they become symptomatic or enlarge.

Lymphoid Lesions

Lymphoid disease of the lacrimal gland includes:

• Reactive lymphoid hyperplasia
• Atypical lymphoid hyperplasia
• Non-Hodgkin lymphoma

Orbital lymphoma is more common in older adults and often presents as a painless, slowly enlarging lacrimal gland mass.

Idiopathic Orbital Inflammation

Idiopathic orbital inflammatory disease may involve the lacrimal gland and present as inflammatory dacryoadenitis.

It commonly produces:

• Acute pain
• Swelling of the lateral upper eyelid
• Tenderness
• Conjunctival injection
• Diplopia
• Proptosis

A rapid response to corticosteroids may occur, but corticosteroid responsiveness does not by itself establish the diagnosis.

Sarcoidosis

The lacrimal gland is one of the most commonly affected orbital structures in sarcoidosis.

Lacrimal gland involvement may be:

• Bilateral
• Painless or mildly uncomfortable
• Associated with dry eye
• Associated with systemic pulmonary, skin, or lymph node disease

Sarcoidosis is particularly important in younger and middle-aged adults.

Risk Factors

Risk factors depend on the underlying pathology.

Malignant Epithelial Tumors

Important concerns include:

• Previous incomplete excision of a lacrimal gland epithelial tumor
• Recurrent pleomorphic adenoma
• Longstanding lesion with recent acceleration in growth

Incomplete excision of pleomorphic adenoma can lead to recurrence and, rarely, malignant transformation.

Lymphoma

Sjögren syndrome and other chronic autoimmune conditions may increase the risk of ocular adnexal lymphoma.

Inflammatory Disease

Immune-mediated disease and systemic inflammatory disorders may predispose to lacrimal gland inflammation.

Genetics

Genetic abnormalities vary according to tumor type.

Certain lymphomas have characteristic chromosomal translocations and molecular abnormalities.

Sarcoidosis has complex genetic susceptibility with HLA and other immune-related associations.

Most benign epithelial lacrimal gland tumors do not have a simple inherited pattern.

General Prevention

There is no reliable strategy to prevent most lacrimal gland tumors.

The most important preventive principle is appropriate management of a suspected pleomorphic adenoma, because incomplete biopsy or piecemeal excision can increase the risk of recurrence.

Etiology

Epithelial Lesions

Important epithelial lesions include:

• Dacryops
• Pleomorphic adenoma
• Adenoid cystic carcinoma
• Carcinoma ex pleomorphic adenoma
• Mucoepidermoid carcinoma
• Other adenocarcinomas

Nonepithelial Lesions

These include:

• Idiopathic inflammatory dacryoadenitis
• Lymphoma
• Reactive lymphoid hyperplasia
• Sarcoidosis
• Leukemia
• Granulomatosis with polyangiitis
• Metastatic disease
• Plasmacytoma
• Dermoid lesions
• Infectious dacryoadenitis

Commonly Associated Conditions

Lymphoma

A pink, fleshy salmon-patch conjunctival lesion may accompany ocular adnexal lymphoma.

Sjögren syndrome is associated with increased lymphoma risk.

Sarcoidosis

Associated systemic findings include:

• Pulmonary disease
• Bilateral hilar lymphadenopathy
• Uveitis
• Skin disease
• Parotid enlargement
• Cranial neuropathies

Heerfordt Syndrome

This may include:

• Parotid enlargement
• Uveitis
• Facial nerve palsy
• Fever

Löfgren Syndrome

This includes:

• Erythema nodosum
• Bilateral hilar lymphadenopathy
• Arthritis or arthralgia

Diagnosis

History

The history should focus on:

• Duration of the mass
• Rate of enlargement
• Pain
• Diplopia
• Visual decline
• Previous orbital surgery
• Previous lacrimal gland biopsy
• Previous malignancy
• Autoimmune disease
• Constitutional symptoms
• Respiratory symptoms

The pattern of symptoms often provides clues to the underlying pathology.

Clinical Patterns

Benign Epithelial Tumor

A benign epithelial tumor such as pleomorphic adenoma typically causes:

• Slow, painless progression
• Proptosis
• Inferonasal globe displacement
• Upper eyelid fullness

The course may extend over months to years.

Malignant Epithelial Tumor

Features concerning for malignancy include:

• Relatively rapid growth
• Significant pain
• Sensory disturbance
• Diplopia
• Ptosis
• Bone destruction
• Perineural symptoms
• Reduced vision

Adenoid cystic carcinoma is especially associated with pain from perineural invasion.

Inflammatory Dacryoadenitis

Inflammatory disease tends to present more abruptly with:

• Pain
• Tender upper eyelid swelling
• Redness
• Conjunctival chemosis
• Tearing
• Diplopia

The lateral upper eyelid may develop an S-shaped contour.

Lymphoma

Lymphoma often presents as:

• Painless
• Slowly progressive
• Firm lacrimal gland enlargement
• Proptosis
• Globe displacement

Bilateral disease is possible.

Physical Examination

A complete ophthalmic and orbital examination should include:

• Visual acuity
• Pupillary examination
• Color vision
• Visual fields
• Intraocular pressure
• Extraocular movements
• Eyelid position
• Proptosis measurement
• Cranial nerve examination
• Slit-lamp examination
• Dilated fundus examination

Globe Displacement

Lacrimal gland masses characteristically displace the globe inferonasally because the gland lies in the superotemporal orbit.

The degree and direction of displacement provide useful localization information.

Optic Nerve Assessment

Large or posterior lesions can compress the optic nerve.

Signs of compressive optic neuropathy include:

• Reduced visual acuity
• Dyschromatopsia
• Relative afferent pupillary defect
• Visual field loss
• Optic disc edema or pallor

Any evidence of optic nerve compromise requires urgent evaluation.

Anterior Segment Findings

Depending on the underlying disorder, slit-lamp examination may demonstrate:

• Conjunctival masses
• Conjunctival inflammation
• Episcleritis
• Scleritis
• Dry eye
• Keratic precipitates
• Anterior chamber cells and flare
• Synechiae

These findings may point toward inflammatory or systemic disease such as sarcoidosis.

Posterior Segment Findings

Possible findings include:

• Retinal vasculitis
• Peripheral vascular sheathing
• Intermediate uveitis
• Optic disc swelling

These are more suggestive of systemic inflammatory conditions than isolated epithelial tumors.

Systemic Examination

When systemic inflammatory or malignant disease is suspected, examination should look for:

• Lymphadenopathy
• Skin lesions
• Erythema nodosum
• Arthritis
• Hepatosplenomegaly
• Pulmonary signs

Diagnostic Tests and Interpretation

Laboratory Evaluation

Laboratory testing should be guided by the clinical differential rather than performed indiscriminately.

Possible tests include:

• CBC with differential
• ESR and CRP
• Serum protein electrophoresis
• ACE and other sarcoid-directed testing
• ANCA when granulomatosis with polyangiitis is suspected
• ANA when autoimmune disease is suspected
• Syphilis serology
• Tuberculosis testing

Modern sarcoidosis workup generally relies more heavily on the overall clinical picture and tissue confirmation than on ACE alone.

Orbital Imaging

CT

Orbital CT is useful for evaluating:

• Tumor location
• Bone remodeling
• Bone erosion or destruction
• Calcification
• Extension into adjacent structures

Bone destruction strongly increases concern for malignancy or aggressive inflammation.

MRI

MRI provides superior soft-tissue characterization and is useful for assessing:

• Perineural spread
• Intracranial extension
• Cavernous sinus involvement
• Orbital apex extension
• Relationship to surrounding muscles and nerves

Contrast-enhanced MRI is especially valuable when malignant disease is suspected.

Chest Imaging

Chest radiography or CT may be indicated if considering:

• Sarcoidosis
• Tuberculosis
• Metastatic disease
• Primary thoracic malignancy

Biopsy Principles

Biopsy strategy depends strongly on the suspected diagnosis.

Important Principle – Pleomorphic Adenoma

A lesion strongly suspected to be a pleomorphic adenoma should generally not undergo incisional biopsy, because violating the pseudocapsule can seed tumor cells and increase the risk of recurrence.

The preferred approach is complete intact excision when technically appropriate.

Inflammatory or Lymphoid Lesions

Biopsy is often appropriate when:

• The diagnosis is uncertain
• Lymphoma is suspected
• The lesion is atypical
• Steroid response is incomplete
• The disease recurs
• Malignancy is possible

Preferred Biopsy Site

When lacrimal gland biopsy is required, the orbital lobe is often preferred when feasible to reduce damage to the ductules of the palpebral lobe and thereby reduce postoperative dry eye.

Sarcoidosis Biopsy

Tissue may be obtained from:

• Lacrimal gland
• Conjunctiva
• Skin lesion
• Lymph node
• Pulmonary tissue

Histology demonstrates noncaseating granulomas, but infectious causes of granulomatous inflammation must be excluded.

Special stains and microbiologic testing may be necessary for:

• Mycobacteria
• Fungal organisms

Pathological Findings

Adenoid Cystic Carcinoma

Histologic patterns include:

• Cribriform
• Tubular
• Basaloid
• Solid
• Other mixed patterns

Perineural invasion is a characteristic and clinically important feature.

Pleomorphic Adenoma

Pleomorphic adenoma contains a mixture of:

• Epithelial elements
• Myoepithelial elements
• Myxoid or chondroid stroma

Sarcoidosis

Typical pathology shows noncaseating granulomas after exclusion of infection.

Idiopathic Orbital Inflammation

Pathology may show a mixed inflammatory infiltrate with:

• Lymphocytes
• Plasma cells
• Macrophages
• Variable eosinophils
• Fibrosis
• Tissue edema

Differential Diagnosis

Important differential diagnoses include:

• Pleomorphic adenoma
• Adenoid cystic carcinoma
• Lymphoma
• Reactive lymphoid hyperplasia
• Idiopathic orbital inflammation
• Sarcoidosis
• Granulomatosis with polyangiitis
• Metastatic tumor
• Leukemia
• Dermoid cyst
• Prolapsed orbital fat
• Infectious dacryoadenitis
• Perilacrimal orbital tumors

Prolapsed orbital fat can mimic lacrimal gland enlargement, particularly in older adults.

Treatment

Treatment depends entirely on the underlying diagnosis.

Pleomorphic Adenoma

The preferred treatment is complete surgical excision with the capsule intact.

Incomplete excision should be avoided because it increases the risk of:

• Recurrence
• Multifocal seeding
• Malignant transformation

Dacryops

Asymptomatic lesions may be observed.

Symptomatic or enlarging lesions may undergo:

• Marsupialization
• Complete excision

depending on location and anatomy.

Adenoid Cystic Carcinoma

Management usually requires multidisciplinary orbital oncology care.

Treatment may involve combinations of:

• Complete surgical resection when feasible
• Radiation therapy
• Systemic therapy in selected cases

The historical use of routine orbital exenteration has evolved, and modern treatment is individualized according to tumor extent, margins, perineural spread, and available eye-sparing oncologic approaches.

Lymphoma

Treatment begins with tissue diagnosis and staging.

Management may include:

• Local radiation for localized disease
• Systemic immunotherapy
• Chemotherapy
• Combined approaches

Treatment depends on lymphoma subtype and systemic involvement.

Sarcoidosis

Treatment depends on severity.

Possible approaches include:

• Observation for mild disease
• Systemic corticosteroids
• Steroid-sparing immunomodulatory therapy

Surgery is generally limited to diagnostic biopsy or selected cases requiring decompression.

Idiopathic Orbital Inflammation

Corticosteroids are commonly used when the diagnosis is sufficiently secure.

A prompt clinical response is expected in many cases.

However, lack of response, recurrence, or atypical imaging should prompt reconsideration of the diagnosis and often biopsy.

Steroid-resistant disease may require:

• Immunomodulatory therapy
• Radiation therapy
• Alternative diagnosis workup

Infectious Dacryoadenitis

Infectious causes require organism-directed treatment.

Bacterial disease may require:

• Systemic antibiotics
• Drainage if abscess develops

Steroids should not be given as stand-alone treatment if infection remains possible.

Referral

Referral may include:

• Oculoplastic/orbital surgeon
• Ocular oncologist
• Hematology/oncology
• Rheumatology
• Pulmonology
• Neurology or neurosurgery
• Infectious disease

depending on the suspected pathology.

Inpatient Considerations

Admission may be required for:

• Compressive optic neuropathy
• Rapidly progressive orbital inflammation
• Severe infection
• Intravenous corticosteroid treatment
• Orbital surgery
• Significant neurologic extension

Optic nerve dysfunction from a lacrimal gland mass requires urgent management.

Follow-Up

Follow-up depends on etiology.

Inflammatory disease may require close review during active treatment, often within days to weeks.

Malignant tumors require long-term surveillance for:

• Local recurrence
• Perineural spread
• Distant metastasis

Benign lesions that have been completely excised generally require less intensive monitoring but still need assessment for recurrence when clinically indicated.

Monitoring During Corticosteroid Therapy

Patients receiving prolonged corticosteroids should be monitored for:

• Elevated IOP
• Cataract
• Hyperglycemia
• Hypertension
• Bone loss
• Other systemic adverse effects

Coordination with primary care or relevant medical specialists is important.

Prognosis

Prognosis varies dramatically with the underlying diagnosis.

Benign Lesions

Completely excised benign epithelial tumors generally have an excellent prognosis.

Inflammatory Disease

Idiopathic inflammation and sarcoidosis often respond well to treatment but can recur.

Lymphoma

Prognosis depends on histologic subtype and systemic stage.

Adenoid Cystic Carcinoma

Adenoid cystic carcinoma has a more guarded prognosis because of:

• Perineural invasion
• Local recurrence
• Intracranial extension
• Distant metastasis

Long-term surveillance is essential.

Complications

Potential complications include:

• Proptosis
• Diplopia
• Ptosis
• Exposure keratopathy
• Dry eye after lacrimal gland surgery
• Optic neuropathy
• Vision loss
• Tumor recurrence
• Intracranial extension
• Metastatic disease

The key clinical pearl is: a slowly enlarging painless superotemporal orbital mass suggests a benign epithelial or lymphoid lesion, whereas rapid growth, pain, sensory symptoms, bone destruction, or perineural involvement should raise strong suspicion for lacrimal gland malignancy, particularly adenoid cystic carcinoma.