FIGURE 2. Coronal ¹⁸F-FDG PET image (A) and ¹⁸F-FLT PET image (B) of patient 9, with multiple lesions in both lungs on ¹⁸F-FDG PET and no lesions on ¹⁸F-FLT PET. Metastasis in the right acetabulum, which had been irradiated 1 wk earlier, is prominent on ¹⁸F-FDG PET (large arrow) but less intense on ¹⁸F-FLT PET (large arrow). In addition, irradiated bone marrow cranial of tumor has become metabolically inactive, as is seen on ¹⁸F-FLT as uptake less intense than that in nonirradiated bone marrow (small arrow).