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Pigmented villonodular synovitis, nodular form - Knee - MRI
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Pigmented villonodular synovitis, nodular form - Knee - MRI
  • Case ID: 411
  • Diagnosis: Pigmented villonodular synovitis, nodular form
  • Category: Soft Tissue Tumors
  • Category Type: Pigmented villonodular synovitis
  • Category Sub Type: Benign
  • Location: Knee
  • Age: 50
  • Sex: M
  • Treatment: Resection
  • Image ID: 2763
  • Image Type: MRI
  • Images relating to this case: 2763, 2764 .

A 50-year-old-male presented with a popliteal tumor mass that was felt by the initial clinician to be a neoplastic process such as a synovial sarcoma. This sagittal proton density MRI shows a fairly large popliteal mass arising from the posterior aspect of the knee joint behind the femoral condyles with erosion into the posterior aspects of the condyle and extensive filling of the popliteal space. It is a low signal lesion that is not characteristic of a malignant synovial sarcoma but is typical for a localized, nodular form of PVNS. Notice that there is no involvement of the anterior part of the knee joint as is seen in the more diffuse, generalized form of PVNS.


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