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