题目内容
A 50-year-old woman undergoes screening colonoscopy as part of a routine health maintenance workup. An isolated l-cm pedunculated polyp is found in the sigmoid colon. The excised polyp histologically shows well-differentiated glands with no invasion of the stalk. Which of the following investigational research procedures can most clearly distinguish whether the polyp represents hyperplasia of the colonic mucosa or a tubular adenoma. _ _
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