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All tumours were non-malignant tubular adenomas confined to the colonic mucosa. (A) Small sized tumours were comparable with “aberrant crypt foci”, (B) small sized tumours, (C) medium sized tumours, and (D) large sized tumours were most often pedunculated. No invasive growth with penetration of the lamina muscularis mucosae was observed. Original magnification ×160.
