Fig. 13.

Mild synovial thickening (grade 1) and severe joint enhancement (grade 2). a-b Coronal T2-weighted image (TR/TE 2,600/110 ms, a) and sagittal oblique fat-saturated T2-weighted image (TR/TE 5,400/77 ms, b) show a large effusion with high signal intensity and some nodular areas of synovial thickening with intermediate signal intensity in posterior portion of the upper joint compartment (arrows). c Corresponding early postcontrast fat-saturated T1-weighted (TR/TE 670/10 ms) image demonstrates enhancement of the synovium (white arrow) and peripheral joint fluid (arrowheads) involving the entire upper compartment, with same signal intensity as surrounding veins (black arrows). T1 fs Gd contrast-enhanced fat saturated T1-weighted, T2 T2-weighted, T2 fs fat saturated T2-weighted