A carcinoid tumor

A carcinoid tumor starts in the hormone-producing cells of various organs. Carcinoid tumors most often develop in the gastrointestinal tract, in organs such as the stomach or intestines, or in the lungs. However, a carcinoid tumor can also develop in the pancreas, a man’s testicles, or a woman’s ovaries. More than one carcinoid tumor can occur in the same organ.

Here is a general overview of where carcinoid tumors begin:

• 39% occur in the small intestine.
• 15% occur in the rectum.
• 10% occur in the bronchial system of the lungs.
• 7% occur in the appendix.
• 5% to 7% occur in the colon.
• 2% to 4% occur in the stomach.
• 2% to 3% occur in the pancreas.
• About 1% occurs in the liver.
• They rarely occur in ovaries, testicles, and other organs.

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