Rete-like collateral PICA associated aneurysm surgical resection.

Rete-like collateral is rare in humans, especially at posterior circulation. This case report explores the direct resection of a ruptured aneurysm associated with the bilateral rete-like collateral artery of posterior inferior cerebellar artery (PICA). The aneurysm was successfully treated by surgical resection. This case highlights the importance of recognizing this unusual vascular anatomy and demonstrates that microsurgical resection of ruptured aneurysm associated with bilateral anomalous posterior inferior cerebellar anastomotic arteries was an effective treatment and careful consideration of the anatomical characteristics concerning the interesting aneurysm and the variant PICA was critical for sate treatment.