Large unruptured proximal (A1) anterior cerebral artery aneurysm with aplasia of the contralateral A1.

摘要

Aneurysms from proximal A1 horizontal segment of anterior cerebral artery (ACA) are rare and may be associated with vascular anomalies of the circle of Willis. We report one such patient with a large un-ruptured proximal A1 aneurysm with absent contra-lateral A1.