Gouty tophus in the quadriceps tendon: exclude malignancy

A 69-year-old man attended our outpatient department with pain and discomfort just above both his knees. He said the problem had been troubling him for 4 months. On examination, we found swelling of the soft tissue at the end of the quadriceps tendon of his right leg (figure); the patient had a full range of movement of his knee with no weakness. The x-ray showed an ill-defined erosion of the…

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