A 77-year-old man with a 3-cm slightly elevated, nongranular type, laterally spreading tumor (LST-NG 0-IIa) of the sigmoid colon was referred to our institute for endoscopic resection (●" Fig.1). Piecemeal underwater endoscopic mucosal resection (UEMR) was carried out with a high definition narrow band endoscope (CF-H190L; Olympus Europa SE, Hamburg, Germany). After UEMR, the margins were ablat...
