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A 38-year-old male presenting with a 1-year history of medial right knee pain. There was no previous trauma (Figs. 1, 2, and 3).
MRI of the right knee. a Sagittal T1W TSE, b coronal fat suppressed PDW FSE, and c axial fat suppressed post-contrast T1W FSE MR images
CT obtained at the time of biopsy
Histology. a H&E x X magnification. b Immunohistochemistry for S100
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The diagnosis can be found at https://doi.org/10.1007/s00256-022-03998-7
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Hesni, S., Lindsay, D. & Saifuddin, A. Test Yourself Question: A 38-year-old male presenting with a 1-year history of medial right knee pain. Skeletal Radiol 51, 1879–1881 (2022). https://doi.org/10.1007/s00256-022-03997-8
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DOI: https://doi.org/10.1007/s00256-022-03997-8