Skeletal Radiology

, Volume 47, Issue 6, pp 865–869 | Cite as

Gouty involvement of the patella and extensor mechanism of the knee mimicking aggressive neoplasm. A case series

  • Christopher Kester
  • Matthew T. Wallace
  • James Jelinek
  • Albert Aboulafia
Case Report


Gout is a common inflammatory crystal deposition disease that occurs in many joints throughout the body. Active gout is most often associated with painful synovitis causing searing joint pains, but gout can also produce large masses of space-occupying deposits called tophi. Tophi are most frequently seen in juxta-articular locations with or without bony erosion and are often misdiagnosed as degenerative joint disease. Soft tissue deposits and tendon involvement are also known manifestations of gout, but can present with indeterminate and alarming findings on imaging. We present three cases of tophaceous gout mimicking aggressive neoplasms in the extensor mechanism of the knee. All cases presented as extensor tendon masses eroding into the patella, with imaging findings initially concerning for primary musculoskeletal malignancy.


Gout Knee Tendon Neoplasm 


Compliance with ethical standards

Conflicts of interest

The authors declare that they have no relevant conflicts of interest to disclose.


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© ISS 2018

Authors and Affiliations

  1. 1.Department of OrthopaedicsPhiladelphia College of Osteopathic MedicinePhiladelphiaUSA
  2. 2.Orthopaedic Oncology, National Center for Bone and Soft Tissue TumorsMedStar Franklin Square Medical CenterBaltimoreUSA
  3. 3.Department of RadiologyMedStar Washington Hospital CenterWashingtonUSA
  4. 4.National Center for Bone and Soft Tissue TumorsMedStar Franklin Square Medical CenterBaltimoreUSA

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