What Are Carcinoid Tumors?

Carcinoid tumors are rare, often slow-growing tumors that form from neuroendocrine cells found throughout the body. Carcinoid tumors most commonly arise in the gastrointestinal system, including the appendix, small intestine, or rectum, but may occur in other sites, including the lungs. In most cases, there is no clear cause of carcinoid tumors. There does not … Read more