Fig. 7.

53-year-old male with radiation-induced osteosarcoma in right ilium before (A-C) and after (D-F) chemotherapy.

A. Axial, T2-weighted MR image showed heterogeneous, T2 hyperintense soft-tissue mass in right ilium. B. Axial, post-contrast, T1-weighted MR image showed soft-tissue enhancement (arrow) with central non-enhancement before chemotherapy. C. Axial PET-CT image demonstrated increased FDG uptake (SUVmax = 21.84) in corresponding lesion. D. Axial, T2-weighted MR image obtained after chemotherapy shows decrease in tumor size. E. Axial, post-contrast, T1-weighted MR image obtained after chemotherapy shows decrease in area of soft-tissue enhancement (arrow). F. Corresponding to fused FDG-MR/PET image obtained after chemotherapy and which showed no pathological FDG uptake (SUVmax = 2.23). FDG = fluorodeoxyglucose, MR/PET = magnetic resonance imaging/positron emission tomography, SUVmax = maximum standardized uptake value