Underwater endoscopic mucosal resection for circumferential adenoma of the ileocecal valve

Underwater endoscopic mucosal resection (UEMR), which was first described by Binmoeller et al. [1], is an endoscopic procedure that reduces the risk of perforation by using buoyancy to maintain a distance from the muscularis propria. Although the en bloc resection rate for UEMR is lower than that for endoscopic submucosal dissection (ESD) for tumors of 20–30 mm in diameter, it has similar local recurrence rates, shorter procedure times, and fewer intraoperative and postoperative adverse events [2].