Neuroendoscopically-assisted Safe and Complete Clipping of a Symptomatic Partially Thrombosed Large Vertebral Artery-Posterior Inferior Cerebral Artery Aneurysm

Abstract

We describe a case involving a partially thrombosed large vertebral artery (VA)-posterior inferior cerebellar artery (PICA) aneurysm presenting with hemifacial spasm. The intraoperative findings revealed the cause of the hemifacial spasm was compression of the root exit zone of the facial nerve by the anterior inferior cerebellar artery, which was displaced by the aneurysm. Clipping of the aneurysm neck and decompression of the facial nerve were successfully performed by neuroendoscopy-assisted microneurosurgery.