Tenosynovial giant cell tumor

Sagittal T1-weighted MRI of the knee demonstrates suprapatellar (arrow) and intraarticular (arrowheads) nodular masses, which show low signal intensity (dark) from hemosiderin deposition.

MRI: magnetic resonance imaging.

Courtesy of Shahla Modarresi, MD, and Cecilia M Jude, MD.

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