Papilledema
Papilledema is bilateral optic disc swelling from raised intracranial pressure, most classically idiopathic intracranial hypertension; imaging to exclude a mass lesion or venous sinus thrombosis must precede lumbar puncture, and acetazolamide is the first-line drug once idiopathic intracranial hypertension is confirmed.
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What this article covers
- Overview
Papilledema is bilateral, usually symmetric optic disc swelling from raised intracranial pressure; it is a sign of a systemic process, never a primary eye disease, and always requires a search for the cause.
- Epidemiology
Approximately 90% of patients with IIH are women of childbearing age with an elevated BMI, making IIH the leading cause of papilledema without a structural lesion.
- Risk factors
Female sex and obesity are the dominant risk factors for IIH, the most common underlying cause of papilledema.
- Pathophysiology
Raised intracranial pressure is transmitted along the subarachnoid space surrounding the optic nerve, stalling axoplasmic flow at the optic nerve head; because both nerve sheaths share the same CSF pressure, the swelling is bilateral.
- Clinical features
Bilateral, usually symmetric disc swelling with blurred margins and dilated, tortuous retinal veins on fundoscopic exam is the defining finding, with an enlarged blind spot on visual field testing…
- Differential diagnosis
Idiopathic intracranial hypertension – obese woman of childbearing age; discriminator is normal neuroimaging and normal CSF composition once mass and venous thrombosis are excluded.
- Diagnosis
Papilledema is confirmed on dilated fundoscopic exam (bilateral disc elevation with blurred margins, venous engorgement, enlarged blind spot); there is no separate criteria set for the sign, so the…
- Management
Step one: in the febrile or systemically ill patient with suspected CNS infection, draw blood cultures and start empiric antibiotics before head CT, so the imaging-before-LP sequence never delays treatment of suspected bacterial meningitis.
- Complications
Permanent visual field loss and blindness are the feared complications, from sustained axonal injury progressing to secondary optic atrophy; serial field testing, not symptom improvement, guides therapy.
- Prognosis
Visual outcome is generally favorable with prompt treatment and correlates with the severity of field loss at presentation; treatment before significant field loss gives the best chance of full recovery.
- Prevention
In IIH with elevated BMI, target at least 5-10% total body weight loss, shown to reduce pressure and improve papilledema; refer to a structured weight-loss program at diagnosis.
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Idiopathic intracranial hypertension (formerly pseudotumor cerebri) is raised intracranial pressure of unclear cause, without a mass lesion or hydrocephalus, occurring mainly in obese women of childbearing age and presenting with headache, papilledema, and visual symptoms. Diagnosis requires an elevated lumbar puncture opening pressure with normal CSF and normal or empty-sella imaging; treatment centers on weight loss and acetazolamide to protect vision, with surgery reserved for medically refractory disease.
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