Chapter 9 The gastrointestinal system/Fig 9.46.jpg

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(A) Longitudinal section through resected bowel, showing two distinct adenomas. The lesion on the left shows the frond-like architecture of a villous adenoma, while that on the right shows the smoother lobulated outline of a tubular adenoma. (B) Low-power photomicrograph of a tubular adenoma, showing that the lesion is made up of distorted, elongated crypts. Even at this power the dark (‘hyperchromatic’) nuclei are visible. Note the raised stalk. This must be examined carefully for signs of early invasion.