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Fig. 4C —Insufficiency fractures—bilateral sacral alae, sacral body, and L5 vertebra—in 68-year-old woman who had undergone radiation therapy for carcinoma of uterine cervix 20 months earlier. Sagittal T2-weighted image shows linear fracture lines in L5 vertebral body and sacral body at level of S1 (arrows). L5 vertebral body is collapsed.