10 Common Colon Polyp Types

7. Villous adenoma

A villous adenoma is the kind of polyp that is most likely to become cancer when left untreated, or undiscovered. It has been estimated that up to 30% of all villous adenoma colon polyps become cancerous. The villous adenoma has specific lumps and bumps protruding from it, much like a cauliflower. They are covered with columnar epithelial cells, which are the cells that line cavities, organs and blood vessels in the body. They can grow large and intrusive, and it is best to remove them as soon as possible from the lining of the colon.