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Spine metastases on PET/CT. (a) and (c) CT and (b) and (d) PET/CT fusion. (a) Multiple sclerotic lesions, two without PET activity (blue arrows), one showing PET activity (green arrow); (b) multiple lytic lesions, one showing PET activity (green arrow), two not showing activity (blue arrows); (c) mixed lesion showing heterogeneity; and (d) mixed lesion with both sclerotic (blue arrow) and nearly imperceptible lytic components (green arrow).
