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Synchronous tumor. A 65-year-old man recently diagnosed with SCC of the right mandibular retromolar trigon. (A, B) Axial CT and PET/CT images show intense FDG uptake in the retromolar trigon; another focal area of increased uptake can be seen in the right soft palate (short arrow); further biopsy confirmed a tumor (metachronous). (C, D) Axial CT and PET/CT images show increased FDG uptake in a right level IIA lymph node (arrow).
