Familial polyposis or familial adenomatous polyposis (FAP) is a premalignant disease. This means that a person with FAP, if left untreated, will invariably develop cancer. Individuals with this disorder grow hundreds of polyps.

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I see you are asking "Is Familial polyposis cancerous"

Familial adenomatous polyposis (FAP) is an inherited disorder characterized by cancer of the large intestine (colon ) and rectum. People with the classic type of familial adenomatous polyposis may begin to develop multiple noncancerous (benign) growths (polyps ) in the colon as early as their teenage years.

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Hereditary non-polyposis colon cancer

Congested turbinates mean a stuffy nose. Rule out polyposis means make sure the stuffiness isn't caused by bening mucous tumors.

Most patients--more than 85%--who undergo an ileoanal anastomosis are being treated for ulcerative colitis; familial adenomatous polyposis is the next most common condition requiring the surgery.