Lung carcinoid tumors are a rare type of lung cancer. Only 1% to 2% of lung cancers are carcinoid tumors and are usually slow growing. These are a type of neuroendocrine tumors, which means they start in special cells, called neuroendocrine cells, found in the lungs and throughout the body.

Carcinoid tumors are unusual, slow-growing cancers. Tumors often arise from many organs in the body, mainly from the gastrointestinal tract such as the stomach, small intestine, colon, appendix, rectum, etc. It can even come from the lungs, ovaries and sperm. complete,...