Intracranial saccular aneurysm and moyamoya disease.

Abstract

Moyamoya disease is rare; its most common symptom in adults is subarachnoid hemorrhage usually diagnosed by angiography. Moyamoya disease and an intracranial saccular aneurysm were discovered in 4 patients. In 2 of the 3 patients suffering a hemorrhage, the aneurysm was the source of bleeding; 3 of the aneurysms were located at the basilar artery bifurcation. Aneurysm should be looked for in all patients with subarachnoid hemorrhage in whom moyamoya disease is found; the patients should be treated as though the aneurysm were the source of bleeding.