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(a) Sigmoidoscopy revealed multiple ulcers with gush-out hemorrhage on the lower rectum (case 2). (b) Mechanical mucosal injury induced by hemoclips and needles caused another gush-out hemorrhage (case 2). (c) The site of bleeding was manually compressed by a forefinger under endoscopic observation (case 2). (d) Compression hemostasis was achieved after 5 min (case 2).
