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Fig. 6B —Insufficiency fractures bilaterally in acetabula and avascular necrosis of left femoral head in 69-year-old woman who had undergone radiation therapy 19 months earlier. Coronal T2-weighted image (3,000/102) shows low-signal lines of fractures in roof of acetabulum (arrows) that correspond to findings shown in A. Geographic hypointense signal is seen in left femoral head with mild flattening (arrowheads) suggestive of avascular necrosis.