A 49-year-old woman with immunoglobulin GK multiple myeloma developed progressive visual loss with bilateral upper and lower central arcuate scotomas. Funduscopic and electrophysiologic studies indicated bilateral optic neuropathy. The immunoglobulin G fraction of the patient's serum reacted with retinal ganglionic cells in bovine retina. The visual abnormalities remitted after myeloablative chemotherapy and disappearance of the paraprotein.
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