Objective To evaluate the value of 18 F-deoxyglucose (FDG) positron emission tomography (PET) in detecting the primary focus of metastatic cancer with an unknown primary.

• 目的探讨18F-脱氧葡萄糖(FDG)正电子发射型体层摄影术(PET)全身显像在原发灶不明转移癌中的作用。