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[Extra-articular localization of nodular synovitis: a case report]
F Gassel1, T Wallny, U A Wagner
1Klinik und Poliklinik für Orthopädie, Universität Bonn.
Summary
Extra-articular nodular synovitis, a rare variant of pigmented villonodular synovitis, presented as a large, benign soft tissue tumor in a young man's leg. Histology confirmed the diagnosis after surgical removal.
Area of Science:
- Orthopedic Surgery
- Oncology
- Pathology
Background:
- Pigmented villonodular synovitis (PVNS) is a common condition affecting joints.
- Extra-articular nodular synovitis is an uncommon presentation of PVNS, occurring outside joint spaces.
- This case highlights a rare, extensive manifestation of extra-articular nodular synovitis.
Observation:
- A 24-year-old male presented with a non-painful, growing mass in his proximal left lower leg.
- Previous trauma to the left tibia was noted.
- Radiographs revealed a soft tissue tumor displacing the tibial cortex; MRI suggested a benign process.
Findings:
- Surgical intervention and subsequent histological examination confirmed a benign tumor.
- The tumor was diagnosed as extra-articular nodular synovitis.
- The etiology of extra-articular nodular synovitis remains largely unknown.
Implications:
- This case underscores the importance of considering rare diagnoses in soft tissue tumors.
- The findings suggest a potential mechanism involving synovial cell displacement.
- Further research into the etiology of extra-articular nodular synovitis is warranted.