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FIGURE 1. A 47-y-old woman with history of papillary thyroid cancer who underwent thyroidectomy and radioiodine ablation. Two years later, patient presented with thyroglobulin level of 6.1 ng/mL (TSH suppressed) and negative findings on 131I WBS. 18F-FDG PET (A) demonstrates small foci of increased 18F-FDG uptake (arrows) corresponding to small lymph nodes in right lower neck on CT (B). These are clearly visualized on fused 18F-FDG PET/CT (C) and were subsequently proven to be thyroid cancer metastases.
