Figure 14. Adenocarcinoma in a 50-year-old man with a mass in the apex of the left lung. Results of multiple biopsies were negative for malignancy. FDG PET-CT was performed for further characterization of the mass. Axial fused FDG PET-CT image shows marked hypermetabolism in the lesion (arrow), which proved to be a poorly differentiated adenocarcinoma at subsequent left upper lobectomy.