Familial Adenomatous Polyposis

Types

Familial adenomatous polyposis has several variations:

• Attenuated familial adenomatous polyposis causes fewer polyps than classic familial adenomatous polyposis, usually less than 100. You have a high likelihood of developing colon cancer by age 60 if the polyps are not removed.
• Gardner's syndrome is similar to familial adenomatous polyposis but also causes bony and dental growths.
• Crails syndrome (Turcot syndrome) is an extremely rare form of familial adenomatous polyposis that is associated with the development of brain cancer.

MYH-associated polyposis is caused by a different gene (the MYH gene) than the one that causes familial adenomatous polyposis, but it has the same colon and duodenum risks.