Sessile<unk>  adenoma seen under microscopy with H&E stain<unk>  often does not cause symptoms. The risk of colon cancer is between 25 and 40%. Sessile<unk>  polyps, as seen during endoscopy or colonoscopy, are flat (rather than raised) and are easily overlooked.<unk>  lesions range in size from small (<5 mm) to large, and often have a "mucous cap" overlying the polyp.<unk>  lesions are frequently located on the folds of the colon (haustral folds).
Serrated polyposis syndrome
Familial adenomatous polyposis
Juvenile polyposis syndrome
MUTYH-associated polyposis
Hereditary nonpolyposis colorectal cancer
Attenuated familial adenomatous polyposis
Peutz–Jeghers syndrome
Ogden syndrome