April 1st 2005
Neuroendocrine tumors manifest in the gastrointestinal tract mainly as carcinoid and pancreatic islet-cell tumors. They comprise an interesting group of rare neoplasms that are derived from neuroendocrine cells interspersed within the gastrointestinal system amd throughout the body. Neuroendocrine tumors are well known for producing various hormonal syndromes and for their indolent clinical course in most patients, although some of these tumors do not produce hormones of clinical significance. Patients may have symptoms for many years before the diagnosis is suspected and confirmed.