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Pigmented villonodular synovitis - Knee - MRI
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Pigmented villonodular synovitis - Knee - MRI
  • Case ID: 406
  • Diagnosis: Pigmented villonodular synovitis
  • Category: Soft Tissue Tumors
  • Category Type: Pigmented villonodular synovitis
  • Category Sub Type: Benign
  • Location: Knee
  • Age: 36
  • Sex: M
  • Treatment: Synovectomy
  • Image ID: 2742
  • Image Type: MRI
  • Images relating to this case: 2738 , 2739 , 2740 , 2741 , 2742, 2743 , 2744 , 2745 , 2746 , 2747 , 2748 .

This sagittal T2-weighted MRI shows extensive soft tissue involvement of the synovium, both anteriorly and posteriorly, most of which shows a low signal characteristic because of the extensive precipitation of hemosiderin in the hemorrhagic synovial tissue. There is also evidence of erosion of the synovium into the femoral condyles in the notch posteriorly. There are also small areas of fluid cystic collections in the joint as demonstrated by focal high signal areas. This low signal feature on the T2-weighted image is almost diagnostic of hemosiderin-laden PVNS and clearly separates it from other conditions such as synovial sarcoma or even rheumatoid synovitis which have far less hemosiderin in the synovial tissue. A hemophiliac knee would have a similar appearance, however.


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