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Key Points

  • Terminology
    • Monoarticular proliferation of hemorrhagic synovium
    • Occurs in joint, bursa, tendon sheath
    • PVNS: Diffuse, articular form
    • Giant cell tumor of the tendon sheath: Localized, extra-articular form
  • Imaging
    • Radiograph: Large effusion ± associated erosions & subchondral cysts
    • MR: Effusion with synovial proliferation, low signal on all sequences & blooms on gradient echo
  • Treatment
    • Synovectomy, radiation, arthroplasty

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We welcome your feedback, please send questions and comments to Marcel Maya, MD