ABSTRACT
Periampullary diverticulum (PAD), which was frequently noticed during endocopic retrograde cholangiopancreatography (ERCP) for examination on patients with pancreaticobiliary diseases, made difficult to cannulate the duct and to perform the endoscopic sphincterotomy (EST). EST was very useful therapeutic modality for pancreaticobiliary disease, but endoscopists are always careful about EST-related complication, especially in patients with PAD. The general principle of EST was not to incise extendedly above the papillary roof, but the following endoscopic findings help to try the extended EST safely above the papillary roof. On the endoscopic examination there was reducible protrusion above papilla by contrast injection or air deflation, which had bile-colored transparency and arborescent capillary network in the usual direction of the bile duct. We have recently experienced 2 cases of extended EST in patients with PAD, who showed the endoscopic findings mentioned above and recovered without bleeding or perforation.