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Angiomyolipoma in the knee--a case report
Masahito Hatori1, Mika Watanabe, Shoichi Kokubun
1Department of Orthopaedic Surgery, Tohoku University School of Medicine, Miyagi, Japan. mhato@mail.tains.tohoku.ac.jp
Upsala Journal of Medical Sciences
|February 4, 2006
Summary
Extrarenal angiomyolipoma, a rare condition, was reported in the knee, initially resembling a sarcoma. Surgical removal was successful, with no recurrence observed after 20 months.
Area of Science:
- Orthopedic Oncology
- Pathology
Background:
- Extrarenal angiomyolipoma (EAM) is a rare mesenchymal tumor.
- EAM typically occurs in the kidney but can arise in extrarenal sites.
- This case represents a potential first report of EAM in the knee joint.
Observation:
- A 38-year-old male presented with a growing mass in the knee.
- Imaging revealed a subcutaneous tumor within the knee joint.
- The tumor mimicked a malignant sarcoma on initial presentation.
Findings:
- Histological examination showed a well-circumscribed tumor.
- The tumor comprised smooth muscle, vascular spaces, connective tissue, and mature adipose tissue.
- No evidence of recurrence was noted 20 months post-excision.
Implications:
- This case expands the known anatomical locations for angiomyolipoma.
- It highlights the importance of considering benign entities in the differential diagnosis of knee masses.
- Early and complete surgical excision appears to be an effective treatment for knee EAM.