Clinical characteristics and prognosis of patients with ulcerative colitis that shows rectal sparing at initial diagnosis

Figure 1 Colonoscopy at initial diagnosis. A: On descending and sigmoid colon, continuous and symmetric micro-erosive inflammation with friability was noted; B: At distal sigmoid colon, transitional zone was noted (arrow); C: On the rectum, normal transparent mucosa with visible vascularity was noted; D: At retroflexion view, there was no evidence of mucosal inflammation.