Large intraosseous T2W slightly hyperintense, T1W intermediate and PD FS hyperintense lesion, involving most of the patella with sparing of thin rim of bone on lateral side. Well-defined T2W hyperintense cystic component within the lesion without fluid-fluid levels. There are multifocal areas of discontinuities in both anterior and posterior cortices of patella with focal areas of grade IV chondromalacia. The lesion shows moderate homogeneous enhancement of the solid component with thin peripheral enhancement of cystic component. No pre-, para- or retropatellar soft tissue component noted. These imaging features are compatible with a giant cell tumor of the patella.
There is a moderate knee joint effusion extending into suprapatellar recess with smooth, diffuse enhancement of the synovium, consistent with synovitis. No evidence of intra-articular loose bodies.
No major ligamentous or meniscal pathology.