Ulcerative Colitis Etiology: idiopathic inflammatory bowel diseaseImaging: superficial bowel wall inflammation limited to colon and rectum Cases of Ulcerative Colitis AP spot image of the rectosigmoid colon from a barium enema shows multiple fine mucosal ulcerations. AXR AP from a barium enema (left) shows the loss of haustral markings in the colon (lead pipe sign). The magnified view (right) suggests the presence of multiple fine mucosal ulcerations. AP AXR (left) and magnified AP spot image of the splenic flexure (right) from a double contrast barium enema shows a large number of small polypoid lesions throughout the colon with the space between the polyps appearing to be denuded and ulcerated. Pathological image of the colon shows colonic pseudopolyps.