MRI
Sagittal T2
Axial T2
Coronal T2
Sagittal T1
Sagittal PD
Sagittal STIR
Axial T1 C+
Coronal T1 C+
Sagittal T1 C+
There is diffuse irregular thickening and proliferation of the synovial lining of anterior and posterior recesses of knee joint forming nodular and villous projections associated with moderate joint effusion. These projections display low T1, intermediate T2 and bright STIR signal intensities with moderate enhancement after contrast administration. The synovial membrane as well as some of the nodular projections exhibit low T2 signal intensity suggesting possible hemosiderine deposition. Some of the synovial masses imprint the surface of adjacent bone causing erosion best seen at medial and lateral aspect of lateral femoral condyle, lateral aspect of lateral tibial condyle and tibial plateau beneath the spine.