FIGURE 2. A 59-y-old man with NPC 16 mo after concurrent chemoradiation therapy. (A) Axial T2-weighted MR image shows an irregular mass (arrow) in the left nasopharynx. (B) ¹⁸F-FDG PET finding is true negative, with the image showing no uptake in the corresponding area. Subsequent biopsy showed this was an inflammatory mass.