Colitis cystica profunda presenting with a mucus pool within the stalk of a pedunculated colon polyp.

lon polypectomy. A colonoscopic examination had been carried out in another hospital several days earlier due to hematochezia and a polyp had been found in the sigmoid colon. The 1.5-cm, pedunculated polyp (●" Fig. 1) had a slight bulge in the stalk, and there was a mucosal bridge at the attachment to the intestinal wall, mimicking a submucosal tumor. The polyp was resected at the midportion of the stalk using an electrosurgical unit (ERBE VIO 300D, Elektromedizin GmbH, Tubingen, Germany) and snare (SD-9U-1, Olympus, Tokyo, Japan). Grossly, the resected specimen was composed of a head portion and stalk containing yellowish mucus. The remaining part of the stalk in the intestinal wall also contained the yellowish mucus (●" Fig. 2). Histologic examination revealed that the polyp was a typical mixed hyperplastic and adenomatous type, composed of tuColitis cystica profunda presenting with a mucus pool within the stalk of a pedunculated colon polyp