<Tr> <Th> MeSH </Th> <Td> C23. 300.825 </Td> </Tr> <Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> <P> A polyp is an abnormal growth of tissue projecting from a mucous membrane . If it is attached to the surface by a narrow elongated stalk, it is said to be pedunculated . If no stalk is present, it is said to be sessile . Polyps are commonly found in the colon, stomach, nose, ear, sinus (es), urinary bladder, and uterus . They may also occur elsewhere in the body where mucous membranes exist like the cervix, vocal folds, and small intestine . Some polyps are tumors (neoplasms) and others are nonneoplastic (for example, hyperplastic or dysplastic). The neoplastic ones are generally benign, although some can be premalignant and / or concurrent with a malignancy . </P> <Table> <Tr> <Th> Polyp </Th> <Th> Histologic appearance </Th> <Th> Risk of malignancy </Th> <Th> Picture </Th> <Th> Syndromes </Th> </Tr> <Tr> <Td> Hyperplastic </Td> <Td> Serrated unbranched crypts </Td> <Td> if polyps <P> are more than 100 </P> </Td> <Td> </Td> <Td> Hyperplastic polyposis syndrome </Td> </Tr> <Tr> <Td> Sessile serrated adenoma </Td> <Td> Similar to hyperplastic with hyperserration, dilated / branched crypt base, prominent mucin cells at crypt base </Td> <Td> Yes </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Inflammatory </Td> <Td> Raised mucosa / submucosa with inflammation </Td> <Td> If dysplasia develops </Td> <Td> </Td> <Td> Inflammatory bowel disease, ulcers, infections, mucosal prolapse </Td> </Tr> <Tr> <Td> Tubular Adenoma (Villous, Tubulovillous) </Td> <Td> Tubular glands with elongated nuclei (at least low - grade atypia) </Td> <Td> Yes </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Traditional Serrated Adenoma </Td> <Td> Serrated crypts, often villous architecture, with cytologic atypia, eosinophilic cells </Td> <Td> Yes </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Peutz - Jeghers Polyp </Td> <Td> Smooth muscle bundles between nonneoplastic epithelium, "Christmas tree" appearance </Td> <Td> No </Td> <Td> </Td> <Td> Peutz--Jeghers syndrome </Td> </Tr> <Tr> <Td> Juvenile Polyp </Td> <Td> Cystically dilated glands with expanded lamina propria </Td> <Td> Not inherently, may develop dysplasia </Td> <Td> </Td> <Td> Juvenile polyposis syndrome, identical polyps in Cronkhite - Canada syndrome </Td> </Tr> <Tr> <Td> Hamartomatous Polyp (Cowden Syndrome) </Td> <Td> Variable; classical mildly fibrotic polyp with disorganized mucosa and splaying of muscularis mucosae; also inflammatory, juvenile, lipoma, ganglioneuroma, lymphoid </Td> <Td> No </Td> <Td> </Td> <Td> Cowden syndrome </Td> </Tr> <Tr> <Td> Inflammatory fibroid polyp </Td> <Td> Spindle cells with concentric arrangements of spindle cells around blood vessels and inflammation rich in eosinophils </Td> <Td> none </Td> <Td> </Td> <Td> </Td> </Tr> </Table>

Where can polyps be found in the body
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