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| Adenoma, Villous Adenomas, Villous | Villous Adenoma | Villous Adenomas An adenoma of the large intestine. It is usually a solitary, sessile, often large, tumor of colonic mucosa composed of mucinous epithelium covering delicate vascular projections. Hypersecretion and malignant changes occur frequently. (Stedman, 25th ed) |