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Fibroma of tendon sheath originating from the knee joint capsule

Toshiaki Hitora1, Tetsuji Yamamoto, Toshihiro Akisue

  • 1Department of Orthopaedic Surgery, Kobe University School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Japan.

Clinical Imaging
|July 26, 2002
PubMed

Insights

This case report details a rare fibroma of the tendon sheath found in the knee. Imaging revealed a unique lesion with specific characteristics on MRI and CT scans.

Area of Science:

  • Orthopedic Surgery
  • Radiology
  • Pathology

Background:

  • Fibromas of the tendon sheath are rare benign soft tissue tumors.
  • They typically arise from the tenosynovium.

Observation:

  • A 50-year-old male presented with a lesion originating from the posterior joint capsule of the knee.
  • Magnetic resonance (MR) imaging identified a lesion posterior to the medial femoral condyle.
  • Computed tomographic (CT) scans showed the lesion to be isodense with muscle.

Findings:

  • The lesion demonstrated consistent hypointensity across T1-weighted, T2-weighted, and STIR MR sequences.
  • No enhancement was observed on contrast-enhanced T1-weighted MR images or postcontrast CT scans.
  • These imaging findings are characteristic of a fibroma of the tendon sheath in this anatomical location.

Implications:

  • Accurate diagnosis of fibroma of the tendon sheath relies on characteristic imaging features.
  • Understanding the typical presentation aids in differentiating it from other soft tissue masses.
  • This case contributes to the literature on rare presentations of tendon sheath tumors.

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