Question: A 67-year-old man presented with an 8-year history of progressive right knee swelling, increasing pain, and limited range of motion. MRI was performed (Fig. 1). Ultrasound-guided biopsy was obtained. Follow-up MRI was performed (Fig. 2), which was followed by surgical resection with the histopathologic examination (Fig. 3).
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The diagnosis can be found at doi: 10.1007/s00256-021–03,860-2
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Mawi, H., Gravel, D., Werier, J. et al. Enlarging knee masses. Skeletal Radiol 51, 205–208 (2022). https://doi.org/10.1007/s00256-021-03859-9