Fig 1.

A 47-year-old woman with the sudden onset of severe headache. Initial noncontrast head CT (A) demonstrates trace sulcal subarachnoid hemorrhage (white arrow) near the vertex. CT angiography performed at the same time (B) is interpreted as having unremarkable findings. Conventional angiography (C) demonstrates mild diffuse irregularity with multifocal narrowings throughout the cerebral vasculature with a beaded appearance, most pronounced in distal right middle cerebral artery cortical branches (black arrow). Findings are most consistent with RCVS. Follow-up catheter angiogram performed 1 month later (D) demonstrates complete resolution of cerebral vasoconstriction (black arrow).