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Invasive CA in a Polyp

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Colon_Adenoma_Villous2_AdenoCA.jpg

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The tumor is considered invasive when it has breached muscularis mucosae to involve submucosa. Adenoma with a focus of invasive adenocarcinoma is referred to as a malignant polyp. They account for 5% of all adenomas.

The image shows invasive adenocarcinoma (lower right) in a large tubulovillous adenoma.

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