Explanation:

Adenomatous polyps should always be removed and followed up by repeat colonoscopy. Hyperplastic polyps have no neoplastic potential.

Familial polyposis should be managed with annual sigmoidoscopic surveillance after age 12. If patient does not develop polyps by age 40   then patient is unlikely to develop familial polyposis thus this high level surveillance can be stopped at that stage.

If polyposis develops, treatment is total colectomy.