Abstract
A 40-year-old man had symptoms of diarrhea and mucinous and bloody stools for one week. He developed severe abdominal pain and presented to our hospital. He had been diagnosed with ulcerative colitis four years ago, although he had not received appropriate treatment at that time. Computed tomography demonstrated intussusception in the ascending colon. Although surgical treatment has been chosen for many previous cases of intussusception in adults, we were able to reduce it endoscopically and evaluate the disease activity of ulcerative colitis. We could not find a tumorous lesion that might have caused intussusception on endoscopy. In adults with ulcerative colitis, intussusception that is not associated with a tumorous lesion is rare. We present this case with a review of the literature.