Comparative Study of Sensitivity of Ga-DOTATOC PET vs Octreoscan SPECT + CT

Inclusion Criteria: * Signed informed consent * Biopsy proven neuroendocrine tumor, neuroblastoma, medulloblastoma, or other somatostatin receptor positive tumor * Off Sandostatin (octreotide acetate)-long acting release (LAR) \> 4 weeks and off immediate release (subcutaneous) for 12 hrs prior to 68Ga-DOTATOC PET-CT * Karnofsky performance status or Lansky Play Scale status of \>= 50 (or Eastern Cooperative Oncology Group \[ECOG\]/World Health Organization \[WHO\] equivalent) * Subject is male; or is a female who is either pre-menarchal, surgically sterile (has had a documented bilateral oophorectomy and/or documented hysterectomy), postmenopausal (\> 1 years without menses), non-lactating, or of childbearing potential for whom a serum pregnancy test (with the results known prior to investigational product administration) is negative; a negative serum pregnancy test will be required for all female subjects with child bearing potential; if a false pregnancy test is suspected, e.g., perimenopausal condition, an obstetrician will be consulted to determine if she is/is capable of becoming pregnant * No therapy other than Sandostatin since last Octreoscan + diagnostic CT * Fresh frozen (recommended) or paraffin fixed (required) specimen of primary or metastases available for ribonucleic acid (RNA) and immunohistochemistry (IHC) Exclusion Criteria: * Pregnancy or breast feeding * Surgical resection, chemotherapy, radiation therapy, or biologic therapy since last Octreoscan + CT; continuation of the same dose of Sandostatin-LAR or subcutaneous Sandostatin is allowed * Medical condition uncontrolled by treatment making completion of study unlikely * Weight more than 400 pounds (subjects who weigh more than 400 pounds will not be able to fit inside the imaging machines) * Inability to lie still for the entire imaging time (e.g. cough, severe arthritis, etc.) * 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