Fully Endoscope-Controlled Clipping Ruptured Intrameatal Anterior Inferior Cerebellar Artery Aneurysm: Report of 2 Cases

Aneurysms of the anterior inferior cerebellar artery (AICA) are a rare entity. Purely intrameatal aneurysms are even rarer. The author reported 2 ruptured intrameatal aneurysms that were treated by fully endoscope-controlled clipping. Retrosigmoid craniotomy was performed and the aneurysm was clipped definitely intraoperative without postoperative deficits except hearing loss and slight facial nerve paresis. Follow-up angiography demonstrated exclusion of the aneurysm, confirming preservation of the distal aneurysms of the anterior inferior cerebellar artery. Endoscopic enhancement of the visual field provided by the endoscope may be a safe and effective application to increase the quality of treatment for intrameatal aneurysm, especially for deep aneurysm.