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11-year-old boy with Ewing’s sarcoma of the left pelvis at his initial staging exam. (a) Axial 18F-FDG PET image. (b) Axial T1 MRI after administration of gadolinium chelate. (c) The fused image of the axial 18F-FDG PET and the axial T1 MRI shows concordance in 18F-FDG PET avidity and gadolinium chelate enhancement.
