insulinoma

Definition of insulinoma

insulinoma (IN-suh-lih-NOH-muh): An abnormal mass that grows in the beta cells of the pancreas that make insulin. Insulinomas are usually benign (not cancer). They secrete insulin and are the most common cause of low blood sugar caused by having too much insulin in the body. Also called beta cell neoplasm, beta cell tumor of the pancreas, and pancreatic insulin-producing tumor.

Source: NCI Dictionary of Cancer Terms