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Related to polyposis: polyposis coli, Intestinal polyposis


in medicine, a benign tumor occurring in areas lined with mucous membrane such as the nose, gastrointestinal tract (especially the colon), and the uterus. Some polyps are pedunculated tumors, i.e., they grow on stems; others, attached by a broad base, are called sessile. Nasal polyps are usually associated with an allergic condition; since they interfere with breathing, it is advisable that they be removed. Uterine and gastrointestinal polyps are likely to cause bleeding, but, more important, they may undergo malignant degeneration and for this reason are also usually removed.



a morbid growth that develops on mucosa of the respiratory tract, uterus, stomach, large intestine, rectum, and urinary bladder. Polyps are villous formations of various shapes; sometimes pear-shaped, they are usually broad-based or pedunculated. They may ulcerate and cause hemorrhages. Modern medical practice considers polyps precancerous, and therefore they are surgically removed.



the common name for the predominantly benthic form of coelenterates. In metagenetic forms, that is, in hydrozoans (except hydras) and scyphozoans, polyps are capable only of vegetative reproduction, forming either medusae (in hydrozoans by budding, in scyphozoans by transverse division) or other polyps. Sexual reproduction is characteristic in such forms only in individuals of the medusa phase—free-swimming individuals or individuals remaining attached to the polyp. In homogenetic forms (hydrida and anthozoans), the polyps are capable of both sexual and vegetative reproduction. With sexual reproduction, larvae develop from the eggs and are transformed into polyps.

Polyps usually are cylindrical and measure from several millimeters to several centimeters tall (rarely up to 1 m). The upper part of the body contains the mouth, which is surrounded by tentacles. The base serves as a foot by which the polyp attaches itself to the substrate (in solitary forms) or to the colony (in colonial forms). There is often a hard external or internal skeleton of organic matter or limestone. The nervous system, which is developed considerably less than in the medusa, is in the form of a subepithelial nerve ganglion. Sex glands are present only in homogenetic forms and are located in the ectoderm (in Hydrida) or in the entoderm (in anthozoans). Sexual products are eliminated through ruptures in the walls of the gonads. In rare cases (in some actiniae), development occurs in the gastral cavity of the maternal body.

Polyps, except for hydras and a few related forms, are marine organisms. The majority lead a sedentary life; many form colonies. Movements are limited by the extension and contraction of the body and tentacles. Some solitary forms, hydras and actiniae, move slowly along the substrate; a few actiniae inhabit the depths. Polyps feed predominantly on animal substances, usually capturing their prey with their tentacles.


See references under COELENTERATA.



(invertebrate zoology)
A sessile cnidarian individual having a hollow, somewhat cylindrical body, attached at one end, with a mouth surrounded by tentacles at the free end; may be solitary (hydra) or colonial (coral).
A smooth, rounded or oval mass projecting from a membrane-covered surface.


1. Zoology one of the two forms of individual that occur in coelenterates. It usually has a hollow cylindrical body with a ring of tentacles around the mouth
2. Pathol a small vascularized growth arising from the surface of a mucous membrane, having a rounded base or a stalklike projection
References in periodicals archive ?
A finding of extensive polyposis without associated sinusitis and inspissated mucus is not common in patients with CF.
Although typical for CCS, the initial symptoms of this patient fulfilled diagnostic criteria for eosinophilic gastroenteritis, but the development of alopecia, onychodystrophy, and gastrointestinal polyposis made it clear that CCS was the correct diagnosis.
Over the next 12 months, the patient's condition improved significantly, with marked regression of the intestinal polyposis, resolution of the diarrhea and hypoalbuminemia, weight gain, regrowth of body hair, and normalization of the nail and skin findings.
Coverage of the Familial Adenomatous Polyposis Coli pipeline on the basis of therapeutic class, route of administration and molecule type.
The mechanism by which solitary nasal polyps and nasal polyposis develop is unknown, and the issue is controversial.
Many thousands of patients suffering from diseases in the small intestine such as Crohn's, celiac disease, unexplained abdominal pain with diarrhea, polyposis, intestinal tumors, iron deficiency anemia and obscure bleeding have already benefited from this innovative technology.
Despite recent suggestions to the contrary by some video capsule endoscopy (VCE) enthusiasts, push enteroscopy remains the preferred method for evaluation of patients with familial adenomatous polyposis (FAP), based on the results of his prospective comparative study, said Dr.
The mission of the HCCA is the prevention of colon cancer caused by the inherited syndromes of colon cancer including: Familial Adenomatous Polyposis (FAP), Gardner syndrome, Juvenile Familial Polyposis, Hereditary Non Polyposis Colorectal Cancer (HNPCC), Attenuated Adenomatous Polyposis Coli (AAPC) and Peutz-Jeghers Syndrome.
Typically, hyperplastic polyposis is considered an innocent entity.
The two teams located the gene underlying familial adenomatous polyposis (FAP), an inherited disorder affecting 1 in 5,000 people in the United States.
01% was applied for four weeks and, among patients with partial nasal obstruction from polyposis, about 50% had complete resolution of their polyps.
1-4) Common causes of medial blockage are nasal polyposis and mucosal swelling.