FIGURE 3. Transverse and sagittal PET, noncontrast-enhanced CT, and PET/CT images of 65-y-old patient who underwent staging for a squamous cell carcinoma of the tongue. (A) Primary extends from right lateral border of tongue inferiorly to floor of mouth, posteriorly to base of tongue, and laterally to pharyngeal wall. There were no signs of osteolysis at adjacent mandibula (bone window not shown), which was also confirmed in helical contrast-enhanced CT acquired with 3-mm slices (not shown). In addition, second primary with osseous maxillary infiltration at posterior alveolar part was found. Bilateral lymph-node involvement easily identified with PET, CT, and PET/CT. Note that FDG uptake in cerebellum is visible on consecutive CT slice and projects into bone as a result of partial-volume effect and leveling intensity of PET image. (B) In sagittal view, intense uptake of ¹⁸F-FDG is seen posteriorly to bladder on maximum intensity projection image (MIP) (* = injection site) and on sagittal slices of PET, CT, and PET/CT. This was a tubulovillous adenoma without histologic signs of cancer.