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FIGURE 6. PET/CT for detection of recurrence. (A) Surveillance 18F-FDG PET/CT after therapy revealed prominent physiologic mandibular muscle uptake without evidence of recurrent disease. (B) Interval follow-up 18F-FDG PET/CT revealed new subtle hypermetabolic focus in left retropharyngeal region (red arrows) suspected of indicating recurrence. (C) T1-weighted contrast-enhanced MRI confirmed presence of suspect subcentimeter retropharyngeal lymph node (yellow arrow).
