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Intra-articular nodular fasciitis
1Department of Orthopaedic Surgery, Kobe University School of Medicine, Kobe, Japan. yamatetu@med.kobe-u.ac.jp
Summary
This study reports a rare case of intra-articular nodular fasciitis in the knee, a condition previously undocumented in extremity joints. Surgical removal of the knee lesion proved curative, highlighting a novel presentation of this soft tissue tumor.
Area of Science:
- Orthopedic Surgery
- Pathology
- Soft Tissue Tumors
Background:
- Nodular fasciitis is a benign soft tissue tumor typically found in the extremities.
- Intra-articular occurrences of nodular fasciitis are exceedingly rare.
- This case presents a unique instance of nodular fasciitis within the knee joint.
Observation:
- A 49-year-old male presented with a lesion originating from the posterior joint capsule of the knee.
- The lesion extended into the femoral intercondylar notch.
- Clinical and imaging findings prompted surgical investigation.
Findings:
- Histopathological examination confirmed the lesion as nodular fasciitis.
- Immunohistochemical and electron microscopic analyses revealed a myofibroblastic proliferation.
- The excised lesion showed features consistent with nodular fasciitis.
Implications:
- This case expands the known anatomical locations for nodular fasciitis.
- It underscores the importance of considering nodular fasciitis in intra-articular knee lesions.
- Complete surgical excision was an effective treatment, suggesting a favorable prognosis for this rare presentation.