Simple extraction method using a nontraumatic tube for impacted stool in a diverticulum near the ulcer floor after endoscopic submucosal dissection.

With the development of specific knives and traction devices, endoscopic submucosal dissection (ESD) of colorectal tumors such as those that extend into diverticula, which are technically difficult, is becoming possible [1] [2] [3] [4]. A colonic diverticulum is a false diverticulum without a muscular layer, and therefore only the serosa remains after submucosal dissection. To prevent delayed perforation, complete closure of the diverticulum is necessary; however, colonic diverticula often exist in multiples close to each other, and closure of a diverticulum containing impacted stool carries a risk of causing diverticulitis.