A young woman presents with 1 month of blurry vision and intermittent headaches. She is hypertensive (BP 230/130). Fundoscopic examination shows bilateral blurred disc margins, cotton wool spots, macular edema, mild arteriole attenuation, hemorrhages, and choroidal infarcts. Neurologic exam notes poor visual acuity, red color desaturation, and symmetric hyperreflexia. Initial blood tests reveal elevated BUN and creatinine. All serum autoimmune tests and CSF are normal. She improves after treatment.