Fig. 4.

Normal joint fluid and enhancement. a-b Sagittal oblique images from a 3-year-old girl show normal amounts of fluid in joint recesses. Fluid-sensitive image (TR/TE 5,400/77 ms, fat-saturated, a) shows high signal intensity (arrows). On contrast enhanced fat saturated T1-weighted image (TR/TE 670/10 ms, b) there is corresponding enhancement (arrows). c-d Sagittal oblique fast spin echo images from a 13-year-old girl show normal amounts of fluid (arrow) in the joint recesses, with high signal intensity on fluid-sensitive images (c) and enhancement following contrast application shown as high signal intensity on post-contrast fat-saturated T1-weighted images (d). The slightly expanded venous plexus in the retrodiskal tissue shows high signal intensity on T2-weighted images (* in c) and enhancement (* in d). T1 fs Gd contrast-enhanced fat saturated T1-weighted, T2 fs fat saturated T2-weighted