Pigmented villonodular synovitis of the knee
Persistent knee pain, resistant to therapy
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Synovial hyperplasia with the formation of nodules characterized by the accumulation of intracellular hemosiderin, causing a blooming artifact on GRE T2. There are large erosions of the medial tibial plate and femoral condyle.
MRI shows the extent of the disease and the signal is hypointense on both T1- and T2-weighted sequences.
Case courtesy Dr. Eleonora Renzi