Sessile malignant polyp with favorable histologic features. This sessile tubulo-villous adenoma shows a focus of well-to-moderately differentiated adenocarcinoma that superficially infiltrates the submucosa, barely extending beyond the boundary muscularis mucosae. The invasive edge is 2 mm from the resection cautery margin, indicating an adequate excision.
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This image is taken from Sidney J. Winawer & Michael O'Brien. Chapter 5, In Colonscopy, Advanced Digestive Endoscopy e-books. GastroHep.com.
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