68Ga-DOTATATE PET/CT in Oncogenic Osteomalacia

Inclusion Criteria: * In suspicion of oncogenic osteomalacia according to the clinical features such as hyperphosphaturia, hypophosphatemia, low serum vitamin D3 levels, and osteomalacia. Or prior oncogenic osteomalacia patients in suspicion of relapse or with residual tumor * At least 18 years old * Able to provide informed consent Exclusion Criteria: * Females planning to bear a child recently or with childbearing potential * Renal function: serum creatinine \>3.0 mg/dL (270 μM/L) * Liver function: any hepatic enzyme level more than 5 times upper limit of normal. * Known severe allergy or hypersensitivity to IV radiographic contrast. * Patients not able to enter the bore of the PET/CT scanner. * Inability to lie still for the entire imaging time because of cough, pain, etc. * Inability to complete the needed examinations due to severe claustrophobia, radiation phobia, etc. * Any other medical condition that, in the opinion of the Investigator, may significantly interfere with study compliance.