Intraorbital Optic Nerve Signal Hyperintensity on Magnetic Resonance Imaging Sequences in Perioperative Hypotensive Ischemic Optic Neuropathy


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Abstract

A 61-year-old man experienced severe bilateral posterior ischemic optic neuropathy after cardiac bypass surgery. Routine magnetic resonance imaging sequences were normal, but diffusion-weighted and fluid-attenuated inversion recovery (FLAIR) sequences showed abnormal hyperintensity within both intra-orbital optic nerves. This imaging abnormality has not been previously reported in this setting.

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