GA-68 DOTA-TOC of Somatostatin Positive Malignancies

Inclusion Criteria: * Known or suspected somatostatin receptor positive tumor such as carcinoid; neuroendocrine tumor; neuroblastoma; pheochromocytoma. Supporting evidence may include MRI, CT, biochemical markers, and or pathology report. * Age \> 1. * Karnofsky performance status of \> 50 (or Eastern Cooperative Oncology Group (ECOG) / World Health Organization (WHO) equivalent). * Not pregnant. A negative serum pregnancy test is required for all female subjects with childbearing potential. * Ability to understand a written informed consent document, and the willingness to sign it. Exclusion Criteria: * Hepatic enzymes 5 times greater than the upper limits of normal, serum creatinine \> 3.0 mg/dL (270 Micromole per liter (uM/L). * Patients exceeding the weight limitations of the scanner or are not able to enter the bore of the PET /CT scanner due to BMI * Inability to lie still for the entire imaging time (e.g. cough, severe arthritis, etc.); although at Mission Bay Hospital pediatric patients may be sedated per clinical protocol. * Inability to complete the needed investigational and standard-of-care imaging examinations due to other reasons (severe claustrophobia, radiation phobia, etc.). * Any additional medical condition, serious intercurrent illness, or other extenuating circumstance that, in the opinion of the Investigator, may significantly interfere with study compliance. * Recognized concurrent active infection Previous systemic or radiation treatment for another cancer of any type within the last 2 months. * Use of any other investigational product or device within 30 days prior to dosing, or known requirement for any other investigational agent prior to completion of all scheduled study assessments