A 63−year−old man was referred to our hospital with a history of hematochezia. He had no previous history of abdominal complaints or of abdominal surgery. Physical examination and laboratory parameters showed no abnormalities. Co− lonoscopy revealed diverticulosis in the sigmoid colon, and a 2−cm−diameter, hard mass within multiple diverticula. The mass was surrounded by normal mu− cosa, mimicking a submucosal tumor, and an apparently depressed area was identi− fied at the top of the lesion (l " Fig. 1). Be− cause chromoendoscopy using indigo car− mine dye clearly showed the margin of the depressed area, the lesion was sus− pected to be a depressed−type neoplasm, and magnifying colonoscopy with crys− tal−violet staining showed type IIIL and type IIIs Kudo pit patterns (l " Fig. 2), mainly corresponding to an intramucosal neoplasm; a biopsy sample from the de−
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