Neuroendocrine tumor

Neuroendocrine tumors are rare, accounting for less than 1% of all malignant tumors, and most often occur in the stomach, intestine, and pancreas. The most common of these tumors is carcinoid, with an incidence rate of about 2.5 / 100000, accounting for 50% of all gastrointestinal and pancreatic neuroendocrine tumors. Carcinoids can be divided into foregut (lung, Bronchi and upper gastrointestinal tract up to the jejunum), midgut (ileum and appendix) and hindgut (rectum and rectum). Such tumors can occur throughout the neuroendocrine system, but the most common site of involvement is the pancreas. Neuroendocrine tumors can be divided into two major groups according to whether the substances secreted by the tumor cause typical clinical symptoms; mdash; functional and non-functional.