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FIGURE 2. Diffusely increased 18F-FDG uptake in thyroid of 47-y-old man referred for evaluation of neck lymphadenopathy. Patient was taking thyroxine replacement therapy for hypothyroidism. On ultrasound examination, thyroid gland was prominent and heterogeneous. Fine-needle aspiration biopsy of thyroid revealed chronic thyroiditis. Serum TSH was 0.2 mIU/L (reference range, 0.3–5.0 mIU/L), free thyroxine was 1.6 ng/dL (reference range, 0.8–1.8 ng/dL), and TPO antibodies were elevated at 6,160 IU/mL (reference range, <40 IU/mL), suggesting diagnosis of lymphocytic thyroiditis. Shown are transaxial CT image (A), transaxial PET image (B), transaxial fused PET/CT image (C), and 3-dimensional maximum-intensity-projection image (D).
