FIGURE 2. Transaxial thoracic ¹⁸F-FDG PET scan (A) in 64-y-old male patient shows pathologic ¹⁸F-FDG uptake at lower lobe of left lung consistent with residual disease after 5 chemotherapy cycles (black arrow) with no corresponding CT scan abnormality (B). Follow-up CT scan at 7 mo (C) shows local recurrence at lower lobe of left lung (white arrows).