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FIGURE 3. FDG PET (A–C) and 131I scintigraphy (D) of patient B (Table 1). (A–C) Metastatic follicular thyroid carcinoma with FDG uptake on three consecutive PET scans. (A) Scan, obtained in state of hypothyroidism immediately before planned 131I therapy, shows intense FDG metabolism in known metastasis of thoracic wall. (B) Scan was acquired 3 mo later when patient was receiving oral thyroxine. (C) Scan, obtained 4 wk later under TSH stimulation, shows pattern of intense FDG uptake comparable with patient's initial findings. In addition, note first evidence of small satellite focus (arrow). (D) 131I whole-body scan confirmed retained 131I-uptake capacity of metastasis described. In addition, FDG-negative metastasis in thoracic vertebra and recurrent disease in thyroid bed are shown.
