Distal Basilar Artery "Umbrella Aneurysm" Treated by Radial Artery Graft Bypass From the External Carotid Artery to Posterior Cerebral Artery and Clip Trapping: 2-Dimensional Operative Video. Issue 3 (16th August 2021) - Shenoy, Varadaraya S; Lavergne, Pascal; Qazi, Zeeshan; Ghodke, Basavaraj V; Sekhar, Laligam N