<unk>  tumors are neuroendocrine malignancies
Primary tumors can be located in:
Gastrointestinal tract (55%)
Bronchopulmonary system (30%)
Other sites rarer or may actually be metastases (ovary, liver, gallbladder, thymus, middle ear)<unk>  results from tumor production of serotonin, histamine, bradykinin, kallikrein, and/or prostaglandin
Gastrointestinal tract (55%)
Bronchopulmonary system (30%)
Other sites rarer or may actually be metastases (ovary, liver, gallbladder, thymus, middle ear)
Carcinoid syndrome
Allergic reaction/urticaria
Hemochromatosis
Anaphylaxis
Amyloidosis
Angioedema
Celiac disease
Anxiety attack