[Endovascular treatment of a ruptured aneurysm associated with unilateral moyamoya disease].

We report a case presenting with subarachnoid hemorrhage due to a ruptured aneurysm associated with unilateral moyamoya disease. The patient was a 29-year-old woman exhibiting sudden onset headache. Computed tomography revealed subarachnoid hemorrhage around the brain stem. Cerebral angiography showed a saccular aneurysm at the junction of the left P1 portion of the posterior cerebral artery and its perforator. The right internal carotid artery was occluded at the terminal portion, and the right middle cerebral artery territory was perfused anterogradely via abnormal moyamoya vessels in the basal ganglia. The aneurysm was completely embolized with preservation of the perforator. We suggest that as compared to surgical clipping by craniotomy, endovascular therapy is safe and effective for treatment of intracranial aneurysms associated with moyamoya disease.