Acute Retinal Necrosis Syndrome
Clinical Features:
ARN commonly presents with multifocal peripheral areas of full-thickness retinal necrosis in well-circumscribed patches that rapidly coalesce in a circumferential pattern (Fig. 18.5.1). There is an associated brisk intraocular inflammatory reaction and an occlusive vasculitis that primarily affects the retinal arteries. Vitritis is universal and a mild anterior chamber reaction with keratic precipitates is typical. Elevated intraocular pressure is not unusual. Without treatment, spread is rapid and may also involve the fellow eye.
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