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Transient Regional Osteoporosis

- Discussion:
     - patient presents with pain and possibly a limp;
     - x-rays show severe osteoporosis, and bone scans show increased signal;
     - MRI shows decreased Bone Marrow signal on T1 images and
            increased signal on T2
            - these changes are due to increase in bone marrow water content;
            - joint effusion is also evident in T2-weighted images;
            - may be confused with AVN in MR images;
     - as pts return to normal in 6-10 months MRI images will return to normal.