 The intracranial internal carotid arteries are normal in course and caliber. There is fenestration of the M1 segment of the left middle cerebral artery. The right middle and anterior cerebral arteries are unremarkable. The vertebral arteries, basilar artery, and posterior cerebral arteries are normal in course and caliber. There is an extracranial origin of the right PICA. There is no evidence of flow-limiting stenosis or aneurysm.
Fenestration of the left M1 segment without flow limiting stenosis or aneurysm. 