Although carcinoid tumors are usually benign or locally invasive, show carcinoid tumors of the ileum and the bronchi often malignant behavior.
Carcinoid tumors (neuroendocrine tumors) develop from neuroendocrine cells of the gastrointestinal tract (90% – small bowel tumors), the pancreas and the bronchi of the lungs (Bronchialkarzinoid). More than 95% of all gastrointestinal carcinoid tumors occur in three places: the appendix, ileum and the rectum. Although carcinoid tumors are usually benign or locally invasive, show carcinoid tumors of the ileum and the bronchi often malignant behavior. Carcinoid may be inert endocrinology endocrine active (produces hormones) The most common endocrinological syndrome is carcinoid syndrome. However, most patients with carcinoid tumors do not develop carcinoid syndrome. The probability that a tumor will be endocrinological active, depends on its origin. The highest probability have tumors of the ileum and the proximal colon (40-50%). The probability of endocrine activity is lower in bronchial carcinoid, even lower in carcinoid of the appendix and goes with rectal carcinoid zero. Endocrinological inert carcinoids fall because of their local symptoms and clinical signs on (z. B. pain, GI bleeding and obstruction). They can be detected using angiography, CT or MRI. Carcinoid of the small intestine may show filling defects or other abnormalities in a barium swallow. The final diagnosis is made histologically after biopsy or resection. The diagnosis and treatment endocrinological active carcinoid carried out as described for the carcinoid syndrome.