a tumor that develops from enterochromaffin cells
a tumor that secretes large amounts of the hormone serotonin
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 substances such as serotonin or prostaglandins.
A type of tumor arising in the intestines or bronchi (airways of the lung). The tumor typically produces serotonin that may cause flushing, low blood pressure and diarrhea.