What are polyposis syndromes?

Updated: Jun 06, 2020
  • Author: Jaime Shalkow, MD, FACS; Chief Editor: Cameron K Tebbi, MD  more...
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Answer

Not all polyposis syndromes are familial. Familial polyposis syndromes are divided into 2 major groups based on the presence of adenomas or hamartomas. The inherited adenomatous polyposis syndromes include familial adenomatous polyposis (FAP) and Turcot syndrome; the familial hamartomatous polyposis syndromes include Peutz-Jeghers syndrome and juvenile polyposis.

Although juvenile polyps are common in children, adenomas are quite unusual. The latter are considered dysplastic precancerous lesions that are commonly seen in late adulthood. When discovered in children, they suggest one of several types of inherited CRC. [4]

Although the nomenclature is confusing, diffuse juvenile polyposis differs from juvenile polyposis coli. Diffuse juvenile polyposis is a syndrome with multiple polyps spread throughout the GI tract and presents in younger children (aged 6 months to 5 years); in juvenile polyposis coli, the polyps are confined to the rectosigmoid area and are typically found in older patients (aged 5-15 years). Hamartomatous polyps may also be found in patients with Cowden disease, Cronkhite-Canada syndrome, Bannayan-Riley-Ruvalcaba syndrome, and basal cell nevus syndrome. [5]


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