Convexal subarachnoid hemorrhage in a patient with reversible cerebral vasoconstriction syndrome

(A) CT scan of a 56-year-old man with severe headaches showing presence of superficial convexal SAH along bilateral posterior frontal lobes (arrows).
(B) Conventional angiogram performed a day later shows multiple vessel narrowings (arrows) involving the branches of the posterior and anterior cerebral arteries.
A repeat angiogram performed four weeks later showed restitution of normal arterial caliber (not shown).