Challenging underwater endoscopic mucosal resection of duodenal adenoma successfully achieved with combination of therapeutic pediatric colonoscope and retroflexion

Challenging underwater endoscopic mucosal resection of duodenal adenoma successfully achieved with combination of therapeutic pediatric colonoscope and retroflexion Video 1 Challenging resection of a duodenal adenoma successfully achieved by combining the use of underwater endoscopic mucosal resection, a therapeutic pediatric colonoscope, and retroflexion. Fig. 1 Duodenal adenoma partially in- volving a periampullary diverticulum. Fig. 2 Macroscopically complete resec- tion of the adenoma.