**Carcinoid tumor** is a rare tumor of the gastrointestinal tract, lining the epithelial tissue - the gastrointestinal mucosal cells, it is not malignant, but can become “convalescent” and proliferate onto the inner surface of the cell, causing a tumor to form.
These tumors can range in size from small (small cell carcinomas) to huge ones that can completely block the intestinal tract. The mere fact that they are not malignant opens up a great path for research and understanding of this pathology. This cancer has a specific name - Carcinoid tumor - T. Carcinoidea, which indicates that this is an independent disease along with other tumors that we most often confuse with carcinomas. This disease is better known as pomander, carcinoma or Pomainovsky's disease. This name comes from the German surgeon Karl Pomandin, who described and classified the first case of this tumor in his article in 1899. Although this disease has changed greatly since its first mention thanks to new levels of technology and knowledge, it remains quite difficult to diagnose and treat. Carcinioma-type tumors are not as common as other types of cancer, accounting for approximately 3-4% of all malignant tumors of the gastrointestinal tract. They are more common in the stomach, most often found in three parts - the antrum of the stomach, the cardiac (posterior) parts of the stomach and the duodenum. The most common site is the gastric antrum, which accounts for 75 to 90% of all lesions that occur due to carcinomas