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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
Insights
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.
Abstract:
The authors describe a case of intra-articular nodular fasciitis of the knee in a 49-year-old man. The lesion arose from the posterior joint capsule of the knee and protruded into the femoral intercondylar notch. Histologic findings of the excised lesion were consistent with those of nodular fasciitis. Immunohistochemical and electron microscopic studies revealed a myofibroblastic proliferation. Surgical excision of the lesion was curative. A careful search of the literature revealed no case in which nodular fasciitis occurred in a joint in the extremities.