title: Basal indentation of sessile polypoid lesions: a function of geometry rather than a sign of malignancy.
mesh_terms: D003108:Colonic Diseases / Q000000981:diagnostic imaging; D003110:Colonic Neoplasms / Q000000981:diagnostic imaging*; D006801:Humans; D007417:Intestinal Polyps / Q000000981:diagnostic imaging*; D008961:Models, Structural; D011859:Radiography