NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,863 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

gastrointestinal carcinoid tumor
(GAS-troh-in-TES-tih-nul KAR-sih-noyd TOO-mer)
An indolent (slow-growing) cancer that forms in cells that make hormones in the lining of the gastrointestinal tract (the stomach and intestines). It usually occurs in the small intestine, rectum, or appendix (a small fingerlike pouch of the large intestine). Having gastrointestinal carcinoid tumor increases the risk of forming other cancers of the digestive system.

EnlargeParts of the body where gastrointestinal carcinoid tumors form; drawing of the gastrointestinal tract showing the stomach, small intestine (including the duodenum, jejunum, and ileum), appendix, colon, and rectum.

Gastrointestinal carcinoid tumors form in the lining of the gastrointestinal tract, most often in the appendix, small intestine, or rectum.