[A ruptured aneurysm in the bifurcation of the proximal anterior cerebral artery and the frontopolar artery: case report].

We report a case of ruptured aneurysm in the bifurcation of the proximal anterior cerebral artery and the frontopolar artery. A 49-year-old woman complained of sudden onset of severe headache on December 24, 2000. She was admitted to our hospital and CT scan revealed subarachnoid hemorrhage. Cerebral angiography on the next day revealed an aneurysm in the bifurcation of the frontopolar artery and the proximal anterior cerebral artery. She was operated on using the left pterional approach and complete neck clipping was performed. The post-operative course was uneventful. She was discharged with no neurological deficit two months after the operation.