Image of the Month

A 54-year-old woman presented to the emergency department with headache and loss of consciousness. Unenhanced CT showed subarachnoid hemorrhage with hydrocephalus. She was assessed to be grade 4 on the Hunt and Hess scale for cerebral aneurysms and subarachnoid hemorrhage and was intubated for airway protection. To find out what cerebral angiography revealed, see Image of the Month, page 17.