FIGURE 3. Patient 15, with pulmonary metastases from colorectal cancer. (A) Transaxial ¹⁸F-FDG PET scan demonstrates high ¹⁸F-FDG uptake (B) in metastatic nodule in right middle lobe. (B) ¹⁸F-FLT PET scan shows no tumoral ¹⁸F-FLT accumulation. (C) Corresponding CT scan shows pulmonary nodule in right middle lobe. (D) On Ki-67 immunohistochemistry, 12% of nuclei exhibit immunoreactivity to Ki-67–specific antibody MIB-1, indicating low proliferative activity.