TRANSIENT OSTEOPOROSIS OF THE KNEE

The MR findings in transient osteoporosis of the knee have been descri bed as showing a diffuse area of decreased signal intensity (relative to normal bone marrow) on T1-weighted images and increased signal inte nsity on T2-weighted images. We report a case of transient osteoporosi s, in which MRI showed a crescentic area of abnormal signal intensity in the posterior portion of the lateral femoral condyle, which was bor dered by a rim of low signal intensity, best seen on the T2-weighted i mages. This abnormality was shown to resolve on fellow-up MR scans.