[vih-lus ad-no-muh or ad-uh-NO-muh]
a type of benign (not cancer) polyp inside the colon or other parts of the digestive tract with finger-like projections of gland cells that can be seen under the microscope. These finger-like structures generally make up at least half of the adenoma. Villous adenomas are usually broad-based lesions, and often cause rectal bleeding. Because they can be pre-cancerous, they are usually removed when found. See also adenomatous polyp, colon, polyp, rectum, tubular adenoma, tubulovillous adenoma.