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Fig. 5B —67-year-old man with previously treated differentiated thyroid carcinoma and markedly raised thyroglobulin level. Whole-body iodine scintigraphy was negative. Fused axial SPECT-CT image (top right) and corresponding low-dose CT image (lung windows) (top left) localize uptake in thorax to bilateral lung metastases (arrows). Fused axial SPECT-CT image (bottom right) and corresponding image from low-dose CT (bone windows) (bottom left) localize tracer accumulation in right shoulder to bone metastasis in right scapula (arrowheads). Large focus of uptake in right upper chest was due to mediastinal nodal metastasis (not shown).