Isolated optic nerve sarcoidosis.

To report three cases of sarcoidosis confined to the optic nerve. Chart review of clinical, laboratory, imaging, and optic nerve biopsy findings and a review of the literature. All three cases presented with progressive visual loss and showed enhancement of the intraorbital optic nerve on magnetic resonance imaging. There was no evidence for systemic disease, including a negative workup for sarcoidosis or other infiltrative pathologies. Optic nerve biopsy in each case showed non-caseating granulomas consistent with sarcoidosis. Sarcoidosis confined to the optic nerve is a rare phenomenon but should still be considered in the differential diagnosis of progressive optic neuropathy, even in the absence of systemic disease. .