[A case of anterior communicating artery aneurysm with occlusion of the bilateral middle cerebral arteries].

A patient with ruptured anterior communicating artery aneurysm associated with occlusion of the bilateral middle cerebral arteries is presented. A 70-year-old woman was hospitalized for sudden onset of severe headache and vomiting. She was alert, and no neurological deficit was found. CT scan showed a subarachnoid hemorrhage. Cerebral angiogram demonstrated occlusion of the bilateral middle cerebral arteries and ruptured anterior communicating artery aneurysm. After operation, she fully recovered and was able to walk at the time of discharge. In aneurysmal formation, we know from the literatures that hemodynamic stress plays an important role. In this case, occlusion of the bilateral middle cerebral arteries caused hemodynamic stress on the anterior cerebral arteries and anterior communicating artery. It is suggested that this is a causative factor of aneurysmal formation under systemic hypertension.