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Fasciitis-like proliferation in the knee joint
Takashi Soejima1, Hidetaka Murakami, Nobuhiro Tanaka
1Department of Orthopaedic Surgery, Kurume University School of Medicine, Kurume, Japan. tsoejima@med.kurume-u.ac.jp
Summary
A rare fasciitis-like lesion in the knee joint, resembling nodular fasciitis, was observed in a 52-year-old man. This myofibroblastic proliferation originated from the synovial capsule, impacting the patellofemoral joint.
Area of Science:
- Orthopedic Surgery
- Pathology
- Musculoskeletal Oncology
Background:
- Nodular fasciitis is a benign myofibroblastic tumor
- It typically affects subcutaneous tissues, but can occur in deeper structures
- Intra-articular presentations are exceptionally rare
Observation:
- A 52-year-old male presented with a knee joint lesion
- The lesion was a polypoid mass originating from the synovial joint capsule near the quadriceps tendon
- It caused impingement on the patellofemoral joint
Findings:
- Histologic and immunohistochemical analyses confirmed a myofibroblastic proliferation
- The findings were consistent with nodular fasciitis
- This represents one of the few reported intra-articular cases
Implications:
- Highlights the possibility of nodular fasciitis presenting within the knee joint
- Emphasizes the importance of considering rare soft tissue tumors in intra-articular pathology
- Contributes to the limited literature on intra-articular myofibroblastic lesions