FIGURE 2. Patient 21, with history of colorectal cancer and suggestive nodule in right middle lobe, for which histopathology revealed solitary tuberculoma. (A) Transaxial ¹⁸F-FDG PET scan demonstrates moderate ¹⁸F-FDG uptake (arrow) in tumor. (B) No focal tracer accumulation is seen in corresponding ¹⁸F-FLT PET scan. (C) Corresponding CT scan shows pulmonary nodule in right middle lobe. (D) On Ki-67 immunohistochemistry, 5% of nuclei show immunoreactivity to Ki-67 antigen.