[tube-yoo-ler ad-no-muh or ad-uh-NO-muh]
a type of benign (non-cancerous) polyp in the colon or other parts of the digestive tract that is made up of gland cells formed into tubes, in which the tubular structure generally makes up more than 75% of the adenoma. They usually cause no symptoms, and are often found during screening procedures such as colonoscopy. Because they can be pre-cancerous, they are generally removed when found. See also adenomatous polyp, colonoscopy, polyp, tubulovillous adenoma, villous adenoma.