Figure 2.

Sagittal MR images in the same patient demonstrate a periarticular soft tissue mass situated posteromedial to the proximal tibia, in close relation to the pes anserine tendons. The mass demonstrates intermediate signal on T1 weighted images (A), and heterogeneously high signal on T2 weighted fat-saturated images (B). T1 weighted fat-saturated after gadolinium administration (C), demonstrates heterogeneously avid enhancement. Known areas of calcification are low signal on all sequences (arrow).