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Tubular Adenoma : Unusual Findings

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Uncommon histologic findings in adenomatous polyps include: neuroendocrine cells, Paneth cells, squamous metaplasia, clear cell change (shown here), melanocytes, multinucleated giant cells, malakoplakia of polyp stroma, osseous metaplasia, and metastases from another location.
microcarcinoid (higher magnification of the previous image) discovered in a tubular adenoma. It is important to not diagnose these as carcinoma. Image courtesy of: Laura G. Pastrián MD, La Paz University Hospital, Madrid, Spain.

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