Autoimmune gastritis is an atrophic gastritis of the stomach lining mainly the body and aneurysm due to the appearance of antibodies against the parietal cells of the stomach and intrinsic factors, which can lead to destruction of the mucosal layer. stomach, resulting in anemia and vitamin B12 deficiency, even leading to stomach cancer.

Carcinoid tumors are unusual, slow-growing cancers that usually arise from many organs in the body, but mainly from the gastrointestinal tract (appendice, stomach, small intestine, colon, rectum..). .) and from the lungs, possibly from the ovaries and testes.