= argentaffinoma; n.
a tumour of the argentaffin cells in the glands of the intestine (see apudoma). Carcinoids typically occur in the tip of the appendix and are among the commonest tumours of the small intestine. They may also occur in the rectum and other parts of the digestive tract and in the bronchial tree (bronchial carcinoid adenoma). Carcinoids sometimes produce 5-hydroxytryptamine (serotonin), prostaglandins, and other physiologically active substances, which are inactivated in the liver. If a gastrointestinal tumour has spread to the liver, excess amounts of these substances are released into the systemic circulation and the carcinoid syndrome results – flushing, headache, diarrhoea, bronchial constriction causing asthma-like attacks, and in some cases damage to the right side of the heart associated with fibrosis of the tricuspid valve. Bronchial carcinoids can give rise to the syndrome without metastasizing.

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  • carcinoid — [From Gr. karki nos, a crab + oid.] n. A small tumor (benign or malignant) arising from the mucosa of the gastrointestinal tract; it is usually associated with excessive secretion of serotonin. [WordNet 1.5] …   The Collaborative International Dictionary of English

  • carcinoid — CARCINOÍD, Ă I. adj. referitor la tumorile maligne. II. s. n. pl. grup de tumori din celulele endocrine cu granulaţii citoplasmatice, în organele derivate din tubul intestinal primitiv. (< fr. carcinoïde/s/) Trimis de raduborza, 15.09.2007.… …   Dicționar Român

  • Carcinoid — DiseaseDisorder infobox Name = Carcinoid ICD10 = ICD10|E|34|0|e|20 ICD9 = ICD9|259.2 ICDO = ICDO|8240|3 Caption = Picture of a carcinoid tumour that encroaches into lumen of the small bowel (centre of image). Pathology specimen. The prominent… …   Wikipedia

  • carcinoid — A slow growing type of tumor usually found in the gastrointestinal system (most often in the appendix), and sometimes in the lungs or other sites. Carcinoid tumors may spread to the liver or other sites in the body, and they may secrete… …   English dictionary of cancer terms

  • carcinoid — See c. tumor, c. syndrome. * * * car·ci·noid kärs ən .ȯid n a benign or malignant tumor arising esp. from the mucosa of the gastrointestinal tract (as in the stomach or appendix) * * * n. see argentaffinoma * * * car·ci·noid (kahrґsĭ noid)… …   Medical dictionary

  • Carcinoid syndrome — DiseaseDisorder infobox Name = Carcinoid syndrome ICD10 = ICD10|E|34|0|e|20 ICD9 = ICD9|259.2 ICDO = ICDO|8240|3 8245 Caption = OMIM = MedlinePlus = 000347 eMedicineSubj = med eMedicineTopic = 271 DiseasesDB = 2040 MeshID = D008303 Carcinoid… …   Wikipedia

  • Carcinoid syndrome — A syndrome due to carcinoid tumor which secretes large amounts of the hormone serotonin. The syndrome is directly due to the serotonin. Features include flushing and blushing, swelling of the face (especially around the eyes), flat angiomas… …   Medical dictionary

  • Carcinoid tumor — A tumor which secretes large amounts of the hormone serotonin. Carcinoid tumor is also called an argentaffinoma. The tumor usually arises in the gastrointestinal tract, anywhere between the stomach and the rectum (the favorite spot is in the… …   Medical dictionary

  • carcinoid syndrome — Pathol. the systemic effects, including flushing, palpitations, diarrhea, and cramps, resulting from increased blood levels of serotonin secreted by a carcinoid. Also called carcinoidosis /kahr seuh noy doh sis/. * * * …   Universalium

  • carcinoid crisis — a severe episodic attack of the carcinoid syndrome …   Medical dictionary

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