Inclusion Criteria:  Patients with known or clinically suspected somatostatin receptor positive tumors including but not limited to: gastrointestinal neuroendocrine tumors, pancreatic neuroendocrine tumors, pulmonary neuroendocrine tumors, neuroendocrine tumors - primary unknown, pheochromocytoma, paraganglioma, medullary thyroid cancer, medulloblastoma, meningioma A standard clinical CT or MRI is obtained within 6 months of enrollment Ability to provide written informed consent prior to participation in the study (participant or if required a legal medical decision maker)  Exclusion Criteria:  Weight > 225 kg (weight limit of the PET/CT scanner) Inability to scan (ie. extreme claustrophobia) or inability to lie still for imaging Any additional medical condition, serious inter-current illness, or other extenuating circumstance that, in the opinion of the investigator or attending department physician, may significantly interfere with study performance or interpretation Previous allergic reaction to DOTATATE or somatostatin analogues Lack of intravenous access