Large and long stalk villous adenoma inserting in the rectal dentate line, appearing as a multi lobular mass (1 of 2)

Polyps are classified based on the type of tissue they contain: Tubular adenomas are the most common type. About 80% to 86% of adenomatous polyps are this type. Tubular adenomas are the polyps that are least likely to develop into colon cancer. Villous adenomas are the least common type. About 3% to 16% of adenomatous polyps are this type. Villous adenomas are most likely to become cancerous. Tubulovillous adenomas are a combination of the other two tissue types. About 8% to 16% of adenomatous polyps are this type and are more likely than tubular but less likely than villous adenomas to develop into cancer.