Definition

A type of polyp (abnormal growth) that usually forms on the inner lining of the colon or rectum but can also form in the appendix. Serrated polyps have a saw-tooth appearance when looked at under a microscope. There are three types of serrated polyps: hyperplastic polyps (HPs), sessile (flat) serrated polyps (SSPs, also known as sessile serrated adenomas or SSAs), and traditional serrated adenomas (TSAs). HPs are usually small and rarely become cancer. They are the most common type of serrated polyp. SSPs and TSAs are larger than HPs and are more likely to become cancer if they are not removed.