A polyp that arises from the colon or rectum. It is characterized by the presence of serrated glands and the absence of generalized dysplasia. Some authors have suggested that it is a precursor lesion for some colorectal adenocarcinomas with microsatellite instability. The disease is colorectal sessile serrated adenoma/polyp (MONDO_0006164). Also known as: colorectal SSA, colorectal SSA/P, colorectal SSP, colorectal mixed hyperplastic adenomatous polyp, colorectal mixed hyperplastic adenomatous polyp/serrated adenoma, colorectal sessile serrated adenoma, colorectal sessile serrated polyp.