Siderotic synovitis of the knee
Muscle fibre tear in the back of the knee while dancing.
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Diffuse synovial thickening with hypointense signal on both T1 and T2 weighted images. "Blooming" on T2* gradient echo images due to susceptibility effects of hemosiderin deposits. No focal or nodular lesions. The tibio.fibular joint is also affected. Recent hemorrhage on the medial gastrocnemius head.
Incidental finding. A coagulation disorder was hitherto unknown.