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Multifocal localized pigmented villonodular synovitis arising separately from intra- and extra-articular knee joint:

Hideki Yamashita1, Koji Endo, Makoto Enokida

  • 1Department of Orthopedic Surgery, Faculty of Medicine, Tottori University, 36-1 Nishi-machi, Yonago, Tottori, 683-8504, Japan, hidekiy@med.tottori-u.ac.jp.

European Journal of Orthopaedic Surgery & Traumatology : Orthopedie Traumatologie
|February 16, 2013
PubMed

Insights

Localized pigmented villonodular synovitis (PVNS) can occur separately within and outside the knee joint. This case report details a 14-year-old experiencing distinct intra- and extra-articular PVNS.

Area of Science:

  • Orthopedics
  • Musculoskeletal Oncology
  • Radiology

Background:

  • Pigmented villonodular synovitis (PVNS) is a rare, benign neoplastic proliferation of the synovium.
  • Localized PVNS typically presents as a solitary lesion, often intra-articular.
  • Extra-articular involvement, particularly separate from intra-articular disease, is less common.

Observation:

  • A 14-year-old female presented with a painful medial knee mass.
  • MRI revealed distinct nodular masses: one intra-articular in the anteromedial knee, and another extra-articular on the deep medial collateral ligament.
  • The patient underwent both arthroscopic and open surgical excision for the respective lesions.

Findings:

  • Histopathology confirmed localized PVNS of the intra-articular mass.
  • The extra-articular lesion was diagnosed as pigmented villonodular bursitis.
  • These findings indicate separate intra- and extra-articular occurrences of localized PVNS.

Implications:

  • This case underscores the potential for localized PVNS to manifest independently in both intra-articular and extra-articular compartments of the knee.
  • It highlights the importance of comprehensive imaging and surgical evaluation for suspected PVNS, considering both intra- and extra-articular sites.
  • Understanding these separate occurrences can refine diagnostic and treatment strategies for PVNS.

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