“…Fluorine-18-fluorodeoxyglucose positron emission tomography (18F-FDG-PET) has been successfully used to evaluate different types of malignant tumors (Saunders et al, 1999;Czernin, 2002;Halfpenny et al, 2002;Johns Putra et al, 2004;Rohren et al, 2004;Chen et al, 2011), like esophagus, thyroid, nasopharyngeal and lung carcinoma (Mutlu et al, 2013;Uzel et al, 2013). FDG-PET is also a valuable tool for assessment of treatment response, and also an indicator of prognosis (Uzel et al, 2013).…”