Superior vertical resectability of underwater endoscopic mucosal resection (UEMR) compared to cold snare polypectomy (CSP) for small duodenal tumors.

Underwater endoscopic mucosal resection (UEMR) demonstrated higher rates of vertical resectability compared to cold snare polypectomy (CSP) for small duodenal tumors. However, CSP had shorter procedure times and fewer bleeding events. UEMR should be chosen for lesions that cannot be definitively diagnosed as mucosal low-grade neoplasias.