An adenomatous polyp is a type of growth that forms in the lining of the colon or rectum. These polyps are considered precursors to colorectal cancer, meaning they can develop into cancer over time if not removed. They are usually benign, but their presence can indicate an increased risk for cancer. Adenomatous polyps are classified into three types: tubular, tubulovillous, and villous. The risk of cancer increases with the size and type of the polyp. Regular screening, such as a colonoscopy, is recommended to detect and remove these polyps early, helping to prevent the development of colorectal cancer.