The investigators will scan the patients in suspicion of oncogenic osteomalacia and the confirmed oncogenic osteomalacia patients in suspicion of relapse or with residual tumor after surgery, and compare it to 99mTc-HYNIC-TOC SPECT/CT and 18F-FDG PET/CT of the same patients. The aim of the study was to see if 68Ga-DOTATATE PET/CT can detect more tumors with higher resolution and more exact localization, and then help to develop optimal treatment strategy and improves patient care.