Reversible cerebral vasoconstriction syndrome (RCVS) in a 34-year old woman presenting with headache and a right homonymous hemianopia. A, Axial T2-weighted brain MRI shows a bilateral occipital infarct greater on the left than the right. B, Cerebral angiogram demonstrates multiple areas of segmental arterial narrow (arrows). C, Areas of intracerebral vasconstriction quickly improved 5 minutes after treatment with intravenous verapamil (arrows).