Magnetic resonance angiography of acute aortitis

(a) T₁-weighted imaging shows morphologic changes of circumferential thickening of the descending aortic wall (arrow). (b) T₂-weighted image demonstrates high (bright) signal due to edema in the aortic wall. (c) The inflamed aortic wall is of higher signal than the blood within the aortic lumen on T₁-weighted imaging with fat saturation before the administration of gadolinium contrast media. (d) After the administration of contrast media, the marked enhancement of the inflamed aortic media and adventitia with relatively poor enhancement of the swollen intima can be seen, resulting in the “double ring” finding.