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FIGURE 1. 18F-FDG PET of mediastinal lymph nodes. (A) 18F-FDG PET image of TP lymph node in 64-y-old man. 18F-FDG PET scan shows hypermetabolic lung mass in right middle lobe with standardized uptake value (SUV) of 8.4 and small hypermetabolic lymph node in prevascular space with SUV of 6.3. Lymph node had high activity of 18F-FDG with focal appearance on 18F-FDG PET, so lesion was classified preoperatively as a metastatic lymph node. After surgery, adenocarcinoma and lymph node metastasis were proven on pathologic examination of surgical specimen. (B) 18F-FDG PET image of FP lymph node in 64-y-old man. 18F-FDG PET scan shows hypermetabolic lung mass in right upper lobe with SUV of 12.5 and small hypermetabolic lesion in right paratracheal lymph node with SUV of 4.3. Lymph node had high activity of 18F-FDG with focal appearance on 18F-FDG PET, so lesion was classified preoperatively as a metastatic lymph node. After surgery, squamous cell carcinoma was proven in the main mass, but there was no metastasis in lymph node.
