Fusiform basilar artery aneurysm in a child.

A giant fisuform basilar artery aneurysm ruptured, causing the death of an 11-year-old girl who had presented with a 5-month history of headaches and a 1-month history of progressive brainstem features with choreiform movements. This case, unlike other reported cases, demonstrated no evidence of a generalized arteriopathy, and draws attention to the occurrence of this rare cause in the differential diagnosis of progressive brainstem syndrome in children.