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Figure 9c. Lymph node metastasis in a 48-year-old man with newly diagnosed squamous cell cancer of the tonsil. Axial PET scan (b) demonstrates intense FDG uptake in the region of the left tonsil (arrow) and in a left cervical lymph node (arrowhead), findings that are consistent with primary and metastatic disease, respectively. (a, c) Axial CT (a) and PET-CT fusion (c) images help confirm that the uptake corresponds to the left palatine tonsil (arrow) and left jugular lymph node (arrowhead). The asymmetric nature of the tonsillar uptake and the presence of lymph node metastasis allow definitive diagnosis.
