MRI of her right hip joint. (A) The T1-weighted coronal image illustrates the synovial fluid effusion (white) in the dorsal recessus of the joint around the femoral head. (B) Gadolinium contrast of sagittal images shows diffuse enhancement in synovial tissue along the zona orbicularis to the posterior joint cavity surrounding a contrast-free corpus librum of 4 mm diameter. (C) The synovial proliferation appears in dark grey in the T2-weighted image at the same location. Bone or cartilage did not display erosions or thinning, respectively.