Pigmented villonodular synovitis
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Masses are noted in the joint space with focal areas of low signal on both T1 and T2-weighted sequences representing haemosiderin-laden macrophages within the nodules. Red arrows point out some of the nodules. The red arrow in this images points to a magnetic susceptibility effect from prior surgery. The synovial lining, well seen on the axial images is also dark and thickened.
Pigmented villonodular synovitis (PVNS) results from synovial proliferation and haemosiderin deposition.