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Fig. 5A. —56-year-old woman with lung cancer. Axial images of PET (A), unenhanced CT (B), and fused PET/CT (C) obtained at level of origins of brachiocephalic arteries show increased FDG uptake (maximal standard uptake value [SUV_max], 8) in mediastinum localized to adipose tissue (arrows). Absence of mediastinal adenopathy was noted on 3-month follow-up CT. Note right paravertebral hypermetabolic brown fat (SUV_max, 5.3) in intercostal space. T = trachea, E = esophagus, SVC = superior vena cava, BA = brachiocephalic artery, LSA = left subclavian artery.