Ophthalmology – Papilledema in Children

Basics

Description

Papilledema in children is optic disc swelling caused specifically by elevated intracranial pressure (ICP).

It is usually:

• Bilateral
• Relatively symmetric

but may be:

• Markedly asymmetric
• Rarely apparently unilateral

Papilledema is a sign of raised ICP, not a diagnosis itself.

In children, important causes include:

• Hydrocephalus
• Brain tumor
• Cerebral venous sinus thrombosis
• Meningitis
• Craniosynostosis
• Shunt malfunction
• Idiopathic intracranial hypertension (IIH)

Important Pediatric Principle

In young infants:

Markedly elevated ICP may occur without papilledema

because:

• Cranial sutures remain open
• Fontanelles can expand
• Head circumference may increase rather than pressure being transmitted fully to the optic nerve

Therefore:

Absence of papilledema does not exclude raised ICP in infants or young children.

Epidemiology

The incidence of pediatric papilledema depends on the underlying cause.

Common settings include:

• Hydrocephalus
• Brain tumors
• Craniosynostosis
• Cerebral venous sinus thrombosis
• IIH

Pediatric IIH differs from adult disease.

Pediatric IIH Demographics

Prepubertal Children

There is:

• Less female predominance
• Weaker association with obesity

Postpubertal Adolescents

The pattern becomes more similar to adults:

• Female predominance
• Stronger association with obesity and weight gain

Risk Factors

Risk factors for raised ICP in children include:

• Hydrocephalus
• Ventricular shunts
• Brain tumors
• Head trauma
• Craniosynostosis
• Severe intracranial hemorrhage
• Cerebral venous sinus thrombosis

Risk Factors for Pediatric IIH

Associations include:

• Obesity, especially after puberty
• Recent weight gain
• Obstructive sleep apnea
• Certain medications

Medications associated with intracranial hypertension include:

• Tetracyclines
• Vitamin A derivatives / systemic retinoids
• Growth hormone
• Steroid withdrawal
• Lithium in selected cases

The offending medication should be discontinued when clinically appropriate.

Pathophysiology

Elevated ICP is transmitted through the optic nerve subarachnoid space.

This causes:

Increased retrolaminar pressure → impaired axoplasmic transport → optic disc edema

As swelling progresses:

• Venous congestion develops
• Axons become compressed
• Retinal hemorrhages may occur

With prolonged disease:

• Retinal ganglion cell axons are lost
• Optic atrophy develops
• Permanent visual loss may result

Etiology

Important causes include:

• Hydrocephalus
• Brain tumor
• Cerebral venous sinus thrombosis
• Meningitis
• Encephalitis
• Intracranial hemorrhage
• Cerebral edema
• Craniosynostosis
• Shunt malfunction
• IIH

Rare causes include:

• Spinal tumors
• Craniocervical junction lesions
• Severe venous outflow obstruction

Hydrocephalus

Hydrocephalus is an important pediatric cause of papilledema.

It may result from:

• Obstruction of CSF flow
• Impaired CSF absorption
• Congenital abnormalities
• Tumors
• Hemorrhage
• Infection

Children with a ventricular shunt remain at risk for:

Shunt malfunction and recurrent elevated ICP

Brain Tumors

Infratentorial tumors are particularly likely to cause raised ICP because they may obstruct:

• Fourth ventricle
• Cerebral aqueduct
• CSF pathways

Symptoms may include:

• Morning headache
• Vomiting
• Ataxia
• Cranial nerve palsies

Craniosynostosis

Premature fusion of cranial sutures may restrict skull growth and produce:

• Elevated ICP
• Papilledema
• Optic atrophy
• Permanent visual loss

Children with syndromic craniosynostosis require long-term ophthalmic monitoring.

Idiopathic Intracranial Hypertension

Pediatric IIH is raised ICP without:

• Intracranial mass
• Hydrocephalus
• Cerebral venous thrombosis
• Abnormal CSF composition
• Another identifiable secondary cause

It was historically termed:

Pseudotumor cerebri

History

Ask about:

• Headache
• Vomiting
• Transient visual obscurations
• Diplopia
• Pulsatile tinnitus
• Visual loss
• Medication exposure
• Recent weight gain
• Shunt history
• Head trauma
• Fever
• Neurologic symptoms

Headache

Concerning headache features include:

• Awakening from sleep
• Present on awakening
• Progressive severity
• Worsened by coughing or Valsalva
• Associated vomiting
• Associated diplopia

In a child with known hydrocephalus or a ventricular shunt, a new headache should raise concern for:

Shunt dysfunction or recurrent elevated ICP

Infants and Preverbal Children

They may not report headache.

Possible manifestations include:

• Irritability
• Lethargy
• Somnolence
• Poor feeding
• Vomiting
• Developmental regression
• Increasing head circumference
• Bulging fontanelle
• Abnormal eye movements

Transient Visual Obscurations

Children may report:

• Brief blackouts
• Graying of vision
• Momentary blur

usually lasting:

Seconds

These may occur repeatedly and are often provoked by:

• Standing
• Bending
• Position changes

Diplopia

Diplopia most commonly results from:

Sixth nerve palsy

which may be:

• Unilateral
• Bilateral

In younger children, CN VI palsy may present as:

• New esotropia
• Head turn
• Failure to abduct one or both eyes

Visual Acuity

In early papilledema:

Central visual acuity may remain normal

This is an important distinction from many other optic neuropathies.

Once significant visual acuity loss develops, axonal injury may already be substantial.

Color Vision

Color vision is often preserved early.

Loss of color vision suggests:

• Progressive optic nerve dysfunction
• Axonal injury
• More advanced disease

Pupils

Pupils are often normal early.

A RAPD may occur when optic nerve damage is:

• Asymmetric
• Advanced

Fundus Findings

Typical findings include:

• Swollen optic discs
• Blurred disc margins
• RNFL edema
• Loss of physiologic cup
• Obscuration of vessels crossing the disc margin
• Venous engorgement

Disc Hemorrhages

More severe papilledema may cause:

• Peripapillary flame hemorrhages
• Disc hemorrhages
• Cotton-wool spots

Spontaneous Venous Pulsation

Visible spontaneous venous pulsation makes markedly raised ICP less likely.

However:

Absence of venous pulsation is not diagnostic, because it is absent in some normal individuals.

This sign should not be used alone to exclude or confirm intracranial hypertension.

Paton Lines

Paton lines are concentric peripapillary retinal folds caused by optic disc swelling.

They support the presence of significant true disc edema.

Visual Fields

When children are old enough to perform reliable testing, common abnormalities include:

• Enlarged blind spot
• Nasal defects
• Arcuate defects
• Peripheral constriction

Advanced disease can produce:

• Severe generalized field loss
• Central visual loss

Automated Perimetry in Children

Standard automated visual fields may be difficult in young children.

Reliability improves with:

• Age
• Practice
• Shorter strategies
• Experienced pediatric technicians

Children younger than approximately school age may require alternative functional assessment.

Chronic Papilledema

Long-standing papilledema can produce:

• Disc pallor
• RNFL thinning
• Gliosis
• Optic atrophy
• Permanent visual field loss

An atrophic optic nerve may no longer swell significantly even if ICP rises again.

Therefore:

Absence of recurrent papilledema does not reliably exclude shunt malfunction in an optic nerve that is already atrophic.

Diagnostic Approach

The evaluation should answer:

1. Is the disc truly swollen?
2. Is the swelling due to raised ICP?
3. What is causing the raised ICP?

Neuroimaging

Urgent neuroimaging is required for suspected papilledema.

Preferred imaging is:

MRI brain with and without contrast

plus:

MR venography

when feasible.

Why MRV Matters

MRV helps exclude:

Cerebral venous sinus thrombosis

which can occur in children and may mimic IIH.

Risk factors include:

• Dehydration
• Infection
• Inflammatory disease
• Hypercoagulable states
• Malignancy

CT

CT may be appropriate when:

• MRI is unavailable
• Emergency imaging is needed
• Hydrocephalus or mass effect must be assessed rapidly

However, MRI gives superior evaluation of:

• Posterior fossa
• Venous sinuses
• Infiltrative lesions
• Craniovertebral junction

MRI Findings of Raised ICP

Supportive but nonspecific signs include:

• Empty or partially empty sella
• Enlarged perioptic CSF spaces
• Optic nerve tortuosity
• Posterior globe flattening
• Optic disc protrusion
• Venous sinus stenosis

These findings support but do not independently establish IIH.

Lumbar Puncture

After neuroimaging excludes a dangerous mass lesion or obstructive process, LP may be performed.

Evaluate:

• Opening pressure
• CSF cell count
• Protein
• Glucose
• Additional studies as indicated

Pediatric Opening Pressure

In children, an opening pressure of approximately:

≥28 cm H₂O

is generally considered elevated when measured correctly.

A lower threshold around:

≥25 cm H₂O

may be appropriate in a child who is:

• Not obese
• Not sedated

Clinical interpretation is essential.

Proper LP Technique

Opening pressure should ideally be measured:

• In lateral decubitus position
• With the child relaxed
• Without excessive Valsalva
• Without excessive hip flexion

Sedation can influence measurements.

A single borderline number should not override the overall clinical picture.

OCT

OCT is increasingly valuable in pediatric papilledema.

Assess:

• Peripapillary RNFL
• Optic nerve head volume
• Macular ganglion cell layer

OCT Interpretation

Active papilledema causes:

RNFL thickening

As edema improves:

• RNFL thickness falls

However, a fall in RNFL can represent either:

• Resolution of edema
• Axonal loss

Therefore correlate with:

• Ganglion cell layer
• Visual acuity
• Visual fields

Optic Disc Drusen

The most important cause of pediatric pseudopapilledema is:

Optic disc drusen

Children often have:

• Buried drusen
• Elevated disc appearance
• Indistinct margins

without true increased ICP.

Enhanced-Depth OCT

EDI-OCT can help identify:

• Buried optic disc drusen
• Hyperreflective calcified deposits

It is increasingly preferred over older ultrasound-only approaches.

B-Scan Ultrasonography

B-scan may demonstrate:

• Highly reflective calcified optic disc drusen
• Optic nerve sheath enlargement

It remains useful when the diagnosis is uncertain.

Fundus Autofluorescence

Superficial optic disc drusen may show:

Autofluorescence

Buried pediatric drusen may be less detectable.

Differential Diagnosis

Important mimics include:

• Optic disc drusen
• Crowded hyperopic discs
• Tilted optic discs
• Myelinated RNFL
• Optic neuritis
• Neuroretinitis
• NAION, rare in children
• Infiltrative optic neuropathy
• Hypertensive optic disc edema

Papilledema vs Pediatric Optic Neuritis

Papilledema

Usually:

• Bilateral
• Central acuity preserved early
• Symptoms of raised ICP
• Enlarged blind spot

Optic Neuritis

More likely:

• Significant acuity loss
• Dyschromatopsia
• RAPD if asymmetric
• Pain with eye movement
• Asymmetric or unilateral disease

Children with MOG-associated optic neuritis may have dramatic bilateral disc swelling, so clinical distinction can occasionally be difficult.

Neuroretinitis

Neuroretinitis typically produces:

• Optic disc edema
• Macular star

with visual loss.

Bartonella is a classic cause.

This differs from papilledema, although severe papilledema can occasionally also produce macular exudates.

Treatment Principles

There is no treatment directed specifically at the swollen optic disc.

Treatment must address:

The underlying cause of raised ICP

while protecting vision.

Hydrocephalus

Treatment may require:

• Ventriculoperitoneal shunt
• Endoscopic third ventriculostomy in selected cases
• Revision of a malfunctioning shunt

Shunt Malfunction

Children with ventricular shunts may develop:

• Headache
• Vomiting
• Lethargy
• Diplopia
• Visual changes

Papilledema may recur, but:

A normal optic disc does not exclude shunt malfunction, especially in infants or children with prior optic atrophy.

Pediatric IIH – Weight Management

In children with obesity, particularly adolescents:

Gradual weight reduction is disease-modifying therapy.

Management should be developmentally appropriate and often involves:

• Pediatrician
• Dietitian
• Endocrinology or obesity specialist

Aggressive calorie restriction is inappropriate in growing children.

Acetazolamide

Acetazolamide is the principal medication used to lower ICP in pediatric IIH.

It works by decreasing:

CSF production

Dosing is weight-based and individualized.

A commonly used starting range is approximately:

15–25 mg/kg/day divided into several doses

with titration according to:

• Response
• Tolerance
• Severity

Higher doses may be used under specialist supervision.

Acetazolamide Adverse Effects

Potential adverse effects include:

• Paresthesias
• Fatigue
• GI symptoms
• Dysgeusia
• Metabolic acidosis
• Electrolyte abnormalities
• Kidney stones

Monitor:

• Electrolytes
• Renal function

when treatment is prolonged or high-dose.

Topiramate

Topiramate may be useful when:

• Headache is prominent
• Weight management is relevant
• Acetazolamide is poorly tolerated

Potential adverse effects include:

• Cognitive slowing
• Paresthesias
• Appetite suppression
• Nephrolithiasis

Rarely it can cause:

Acute bilateral angle closure with myopic shift

Furosemide

Furosemide may be used as:

• Adjunctive therapy
• Alternative when acetazolamide cannot be used

Evidence is weaker than for acetazolamide.

Corticosteroids

Systemic corticosteroids are not routine treatment for pediatric IIH.

They can cause:

• Weight gain
• Systemic toxicity
• Rebound intracranial hypertension during withdrawal

Steroids are reserved for specific underlying inflammatory or mass-related conditions.

Repeated Lumbar Punctures

Older teaching suggested serial LPs as treatment.

Modern practice:

Repeated lumbar punctures are not routine definitive therapy for IIH and are not reliably curative.

CSF is rapidly regenerated.

LP may occasionally be used as a:

• Short-term temporizing measure

while definitive therapy is arranged.

Optic Nerve Sheath Fenestration

ONSF may be considered for:

• Progressive visual field loss
• Severe papilledema
• Failure of medical treatment
• Vision-threatening IIH

It is particularly useful when:

• Vision is the dominant concern

rather than headache.

CSF Diversion

Options include:

• Ventriculoperitoneal shunt
• Lumboperitoneal shunt

VP shunting is often preferred in many centers.

Indications include:

• Progressive visual loss
• Medically refractory ICP elevation
• Fulminant disease

Fulminant Pediatric IIH

Rapidly progressive papilledema with visual loss is an emergency.

Urgent treatment may require:

• ONSF
• CSF diversion

rather than prolonged trials of medication.

Brain Tumor

Management may require:

• Neurosurgical resection
• Oncology treatment
• CSF diversion
• Corticosteroids for tumor-associated vasogenic edema when appropriate

Cerebral Venous Sinus Thrombosis

CVST generally requires:

Anticoagulation

under pediatric neurology/hematology supervision, unless there is a specific contraindication.

Medication-Induced Intracranial Hypertension

Potential offending drugs should be discontinued when possible.

Important examples:

• Tetracyclines
• Isotretinoin/other systemic retinoids
• Growth hormone in selected cases

Do not combine tetracycline-class antibiotics with systemic retinoids because both are associated with intracranial hypertension.

Craniosynostosis

Treatment may require:

• Craniofacial surgery
• Neurosurgical decompression

Ophthalmic follow-up remains important before and after surgery.

Referral

Children with suspected papilledema generally require urgent coordination between:

• Pediatric ophthalmology / neuro-ophthalmology
• Pediatric neurology
• Neurosurgery

Depending on cause:

• Neuro-oncology
• Hematology
• Endocrinology
• Craniofacial surgery

may be required.

Follow-Up

Follow-up frequency depends on:

• Severity of papilledema
• Visual field status
• Underlying diagnosis
• Rate of progression

Vision-threatening disease may require reassessment within:

Days to weeks

Monitoring

Serial ophthalmic examinations should include:

• Visual acuity
• Pupils
• Color vision
• Optic disc examination
• Fundus photography
• OCT
• Visual fields when reliable

Children With Shunts

Periodic ophthalmic surveillance can help detect recurrent elevated ICP.

However:

The eye examination should never be used as the sole test of shunt function.

Papilledema may be absent despite shunt failure.

Resolution of Papilledema

Disc edema may take:

Several weeks

to resolve after ICP has normalized.

Therefore, persistent swelling immediately after successful treatment does not necessarily indicate treatment failure.

Prognosis

When elevated ICP is identified and treated promptly:

Visual prognosis is generally good

Poorer outcomes occur with:

• Severe papilledema
• Delayed diagnosis
• Recurrent raised ICP
• Shunt malfunction
• Fulminant IIH
• Established optic atrophy

Optic Atrophy

Long-standing pressure may cause irreversible:

• RNFL loss
• Optic pallor
• Visual field loss
• Central visual loss

Once optic atrophy occurs:

Normalization of ICP cannot restore lost axons.

Patient and Family Education

Families should understand warning symptoms of recurrent raised ICP:

• New or worsening headache
• Vomiting
• Lethargy
• New strabismus or diplopia
• Transient visual obscurations
• New visual loss
• Seizure
• Behavioral change

Children with shunts require particular vigilance for:

Shunt malfunction

Complications

Potential complications include:

• Permanent visual field loss
• Optic atrophy
• Reduced visual acuity
• CN VI palsy
• Chronic headache

Underlying disease may also produce:

• Neurologic injury
• Seizures
• Hydrocephalus
• Stroke
• Death

Treatment complications include:

• Medication toxicity
• Post-LP headache
• Shunt infection
• Shunt obstruction
• Shunt revision
• ONSF-related diplopia or optic nerve injury

Ophthalmology Pearls

• Papilledema in children = optic disc swelling from elevated intracranial pressure.
• Infants with open sutures or fontanelles may have markedly elevated ICP without papilledema.
• The same is true after severe optic atrophy: a damaged optic nerve may be unable to swell.
• In young children, raised ICP may present with irritability, lethargy, vomiting, increasing head circumference, or new strabismus rather than a verbalized headache.
• Sixth nerve palsy is the classic ocular motor manifestation of raised ICP.
• Early papilledema may have normal visual acuity, whereas pediatric optic neuritis usually causes more prominent acuity and color loss.
• The most important pseudopapilledema mimic is buried optic disc drusen.
• MRI brain plus MRV is preferred when papilledema is suspected and the child is stable enough for MRI.
• Pediatric LP opening pressure around ≥28 cm H₂O is generally considered elevated; interpretation depends on obesity, sedation, and technique.
• In adolescents with obesity and IIH, weight management plus acetazolamide are standard initial treatments.
• Systemic corticosteroids and serial lumbar punctures are not routine long-term therapy for IIH.
• Rapidly progressive visual loss from fulminant IIH requires urgent surgical consideration.
• Papilledema can take weeks to resolve after ICP normalizes.
• In a child with a ventricular shunt, absence of papilledema does not exclude shunt malfunction.