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Subsynovial epidermal inclusion cyst of the knee

Anne-Sophie Vanhoenacker1, Patrick Seynaeve2, Frederik Vanrietvelde2

  • 1Department of Radiology, University Hospitals Leuven, Herestraat 49, 3000, Leuven, Belgium. asvanhoenacker@gmail.com.

Skeletal Radiology
|July 18, 2019
PubMed

Insights

A rare intra-articular epidermal inclusion cyst caused knee swelling in a woman. This case highlights the importance of considering these cysts in knee imaging, especially after trauma or surgery.

Area of Science:

  • Orthopedic Surgery
  • Dermatology
  • Radiology

Background:

  • Epidermal inclusion cysts are common benign subcutaneous tumors.
  • Intra-articular location is rare and can mimic other joint pathologies.
  • History of trauma or arthroscopy increases suspicion.

Observation:

  • A 47-year-old woman presented with a painful, swollen right knee.
  • Imaging revealed an intra-articular structure.
  • A 2-year history of knee puncture and arthroscopy was noted.

Findings:

  • A subsynovial epidermal inclusion cyst was diagnosed.
  • Ruptured cysts can elicit an inflammatory response.
  • Surgical excision is the standard treatment.

Implications:

  • This case expands the differential diagnosis for intra-articular knee masses.
  • Radiologists and orthopedic surgeons should consider epidermal inclusion cysts in relevant cases.
  • Early diagnosis and treatment can prevent complications.

Keywords:
Epidermal inclusion cystIntra-articularMRI

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