Figure 3. Axial and coronal positron emission tomography (PET) (a–e) and PET/CT fusion (f–j) images reveal varying degrees of F-18 fluorodeoxyglucose (FDG) uptake in three masses, with SUVmax values of 5.3, 1.8 and 3.2 for left lower cervical, left paratracheal (long arrows) and right paravertebral masses, respectively.