主动脉壁内血肿的MRI表现

目的:探讨主动脉壁内血肿的MRI表现和特点.方法:对9例主动脉壁内血肿的MRI资料进行回顾性分析.其中Stanford A型4例,Stanford B型5例.全部病例均采用MRI SE常规序列.结果:本组病例均示主动脉管腔正常或受压稍变小,约3.5～4.5 cm;管壁均示增厚,横轴位2例管壁呈环形增厚、4例管壁呈新月形增厚;壁内血肿2例于T1WI呈等信号,T2WI呈较低信号,3例血肿T1WI及T2WI呈较均匀性高信号,1例于T1WI呈等信号,T2WI呈高信号;3例壁分层,中间见等信号动脉中膜相隔,两侧信号不一致,T1WI血肿外侧部分呈等信号、内侧部分呈高信号,T2WI两侧均呈高信号.结论:主动脉壁内血肿的MRI表现具有一定特点,诊断价值大.

MRI Appearance of Intramural Hematoma of Aorta

Objective:To investigate the MRI features of intramural hematoma of aorta.Methods:The MRI findings of 9 cases with aortic intramural hematoma were retrospectively analyzed,including Stanford type A (n=6) and stanford type B (n=3).Routine spin echo sequences were used.Results:The aortic lumen were shown as normal or slightly narrowed in all of the patients,with the diameter measured 3.5~4.5cm.The aortic wall were thickened,which were shown on axial plane as ring-like thickening (n=2) or crescent shape thickening (n=4).In 2 cases,the signal intensity of intramural hematoma on T_1WI were iso-intense,on T_2WI were hypo-intense;in 3 cases,the signal intensity on T_1WI as well as T_2WI were homogeneously hyper-intense;in 1 case,it was iso-intense on T_1WI and hyper-intense on T_2WI.3cases had aortic dissection,an iso-intense medium layer was showed,the signal intensities were different in the two sides of the medium layer,with iso-intense in the lateral part and hyper-intense in the medial part of hematoma on T_1WI,and hyper-intense in both parts on T_2WI.Conclusion:MRI is very helpful in the diagnosis of intramural hematoma of aorta.