Unilateral papilledema revealing an intracanalicular optic nerve sheath meningioma.

A 43-year-old female is referred to our clinic for evaluation of an incidentally discovered unilateral papilledema in her right eye of unknown cause. She had no past ocular or medical history. Examination revealed a corrected-distance visual acuity of 20/20 in both eyes. Posterior segment examination showed an elevated right optic nerve head with blurred edges. Ultrasonography failed to reveal optic disc drusen. Visual field testing showed enlargement of the blind spot in the right eye. Magnetic resonance imaging of the brain and orbit was done and revealed enlargement of the intracanalicular and prechiasmatic part of the right optic nerve and a diagnosis of a presumed right intracanalicular optic nerve sheath meningioma was made. She was managed conservatively and several years later remains asymptomatic.