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236 ptic perineuritis (OPN) and acute optic neuritis (ON) are clinically similar disorders. Sometimes, ocular motility disturbances, ptosis, and chemosis can accompany OPN. While ON is common in multiple sclerosis, OPN can be related to vascular, toxic, infectious, metabolic, neoplastic and inflammatory etiologic factors. Unlike demyelinating ON, central vision is spared in OPN, and it responds well to corticosteroids but recurrence is more likely to occur. Differential diagnosis of these disorders is usually dependent on radiologic features.1,2 Fat-suppressed, contrasted magnetic resonance imaging (MRI) sequences can aid in recognizing the distinction between the two disorders.3 The differential diagnosis is very important because the prognosis and the response to treatment are different.1,2 In this article, we report three rare cases with clinical, ophthalmologic and radiologic findings.

Optic Perineuritis: How Does it Differ from Optic Neuritis?