Middle cerebral artery aneurysm associated with Behçet's disease--case report.

A 37-year-old man with Behçet's disease suffered secondary subarachnoid hemorrhage and intracerebral hematoma in the right temporal lobe caused by a ruptured aneurysm of the right middle cerebral artery. The aneurysm was successfully clipped. Aneurysm formation is common in the visceral arteries in Behçet's disease, but extremely rare in the intracranial arteries. Vasculitis may be involved in the etiology of intracranial aneurysms in patients with Behçet's disease.