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Bilateral knee lipoma arborescens: a case report.

C H Yan1, J W K Wong, D K H Yip

  • 1Department of Orthopaedics and Traumatology, The University of Hong Kong, Queen Mary Hospital, Hong Kong. yanchunhoi@yahoo.com.hk

Journal of Orthopaedic Surgery (Hong Kong)
|May 6, 2008
PubMed
Summary

Lipoma arborescens, a benign synovial condition, can cause knee swelling and pain, mimicking gout. Magnetic resonance imaging aids in accurate diagnosis and differentiation from other knee pathologies.

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Area of Science:

  • Orthopedics
  • Radiology
  • Pathology

Background:

  • Recurrent knee swelling and pain can stem from various intra-articular pathologies.
  • Gouty arthritis is a common initial diagnosis for such symptoms.
  • Lipoma arborescens is a rare, benign condition characterized by synovial hypertrophy.

Observation:

  • A 45-year-old male presented with bilateral knee swelling and pain, initially suspected as gouty arthritis.
  • Magnetic resonance imaging (MRI) revealed frond-like proliferations of fatty synovium, suggestive of lipoma arborescens.
  • Arthroscopic synovectomy was performed for therapeutic intervention.

Findings:

  • Histological examination confirmed villiform fatty tissue with thickened synovium, characteristic of lipoma arborescens.

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  • MRI proved effective in visualizing the characteristic synovial changes.
  • The findings highlight the importance of advanced imaging in diagnosing lipoma arborescens.

    • Implications:

    • Accurate differentiation of lipoma arborescens from other intra-articular lesions is crucial for appropriate patient management.
    • Magnetic resonance imaging is a valuable tool for diagnosing lipoma arborescens in patients with persistent knee pain and swelling.
    • Early and correct diagnosis can prevent misdiagnosis and guide surgical intervention, such as synovectomy.