Polypectomy of a colonic muco-submucosal elongated polyp.

partment for screening colonoscopy. He had no gastrointestinal symptoms. Barium enema revealed a curiously elongated polypoid lesion, 12 cm in length, in the transverse colon (●" Fig. 1). Colonoscopy showed an elongated polyp in the transverse colon with a 4-cm long head (●" Fig. 2a) and an 8-cm long stalk (●" Fig. 2b). As the reddish head of the lesion was clearly visualized after spraying with indigo carmine (●" Fig. 3), endoscopic polypectomy was carried out. The resected specimen was covered by wrinkled, normal mucosa, and was 4 cm in length (●" Fig. 4). Histopathological examination revealed edematous submucosa covered by normal mucosa. The dense submucosal layer contained dilated vascular and lymphatic elements (●" Fig. 5). Polypectomy of a colonic muco-submucosal elongated polyp