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Invasive CA in a Polyp

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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.

This whole slide scan of a large polyp shows invasive component clearly invading into the muscularis propria near the center.

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