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Characteristic endoscopic findings of ulcerative colitis complicated by human cytomegalovirus infection. (a) Punched-out ulcers: the round shape of ulcerations with clear demarcation. (b) Longitudinal ulcers: ulcerations running along the lumen of the colon (arrows). (c) Diffuse mucosal defect: many mucosal defects with surrounding reddish and erythematous mucosa. (d) Geographic ulcers: shallow and widespread mucosal defects with unclear demarcation.
