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A Sarcoma Masquerading as a Pseudotumor After Total Hip Arthroplasty: A Case Report
Babar Kayani1, Paul Clarkson, Tony Ng
1Department of Orthopaedics, University of British Columbia, Vancouver, British Columbia, Canada.
This case report details a rare extraskeletal chondrosarcoma mimicking a pseudotumor around a hip implant. Vigilance is crucial, especially when metal ion levels and biopsies are inconclusive.
Area of Science:
- Orthopedic Surgery
- Oncology
- Biomaterials Science
Background:
- Adverse reactions to metal debris from prosthetic hip implants are a growing concern.
- Total hip arthroplasty (THA) complications can include periprosthetic pseudotumors.
Observation:
- A patient presented with escalating pain and MRI findings suggestive of a pseudotumor near a prior THA.
- Serum metal ion levels were within normal limits, and initial biopsies were inconclusive.
Findings:
- Post-revision THA, the patient was diagnosed with extraskeletal chondrosarcoma.
- The patient underwent successful external hemipelvectomy with negative margins.
Implications:
- This case underscores the need for vigilance regarding malignant sarcomas presenting as pseudotumors in the context of hip replacements.
- Early detection is critical, even with normal metal ion levels and non-definitive biopsy results.
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