Colonic intussusception due to filiform polyposis of ulcerative colitis treated by endoscopic reduction

A 20-year-old man with ulcerative colitis presented with epigastric pain and hematochezia. Vital signs were stable and no peritoneal irritation signs were observed. Contrast-enhanced abdominal computed tomography showed a target sign in the descending colon, and he was diagnosed with intussusception ([Fig. 1]). After consulting surgeons, we first attempted to perform colonoscopy for diagnosis and reduction. A colonoscope (CF-Q260DI; Olympus, Tokyo, Japan) was inserted under fluoroscopy ([Fig. 2]). No obvious necrotic findings were observed in the mucosa. A huge granule-aggregating mass was found in the descending colon, and intussusception due to this mass was easily reduced by endoscopic CO2 insufflation. After endoscopic reduction, we advanced the endoscope and confirmed that the mass was originally located near the hepatic flexure of the transverse colon ([Fig. 3]), and the intussusception had been completely reduced ([Video 1]). The biopsy specimen taken from the mass was revealed to be an inflammatory polyposis (filiform polyposis) [1]. On the second day, as the abdominal pain was reduced and normal bowel movement was established, the patient started taking his meals and was discharged the following day.