digestive system adenoma sessile serrated polyp A sessile serrated adenoma, also known as sessile serrated polyp, is a premalignant flat (or sessile) lesion of the colon, predominantly seen in the cecum and ascending colon. A sessile serrated polyp is a serrated polyp that demonstrates abnormal cellular proliferation characterized by a proximally displaced proliferative zone, epithelial serrations, and characteristic distorted basilar crypt architecture with crypt dilation, branching, and lateral growth along the muscularis mucosa. Laura Huerta serrated polyp with abnormal proliferation https://doi.org/10.1038/ctg.2016.60 UMLS:C2732618 NCIt:C96414 sessile serrated polyp/adenoma sessile serrated adenoma/polyp SNOMEDCT:443157008 serrated adenoma type I