FIGURE 3. Coronal and transaxial ¹⁸F-FDG PET (A), ¹⁸F-FLT PET (B), and CT (C) images of patient 4, diagnosed with a large tumor in the right lower lung and a large metastasis in the liver (large arrows on PET images). The liver metastasis, with a 4.5-cm diameter, can be seen on CT. ¹⁸F-FDG PET showed avid uptake in the lung tumor and liver metastasis, whereas ¹⁸F-FLT uptake was slightly less in the pulmonary lesion and almost absent in the liver metastasis.