11例主动脉夹层分离的CT征象分析

An analysis of CT findings in 11 cases of aortic dissection

目的 通过对平扫、增强扫描、动态增强扫描的CT征象分析,以期对主动脉夹层分离作出准确诊断。方法 11例急性主动脉夹层分离病人,均同时进行CT增强前后的扫描,其中4例另行动态增强扫描。结果 11例中CT扫描均显示主动脉夹层的特征表现:(1)双腔征10例,占90％。增强后真假两腔可同时显影;(2)内膜撕裂征4例,占36.3％。CT增强(及平扫)均显示内膜瓣片弯曲的线性负性影;(3)内膜钙化移位征2例,占18.1％。内膜钙化从主动脉壁外缘内移5～12mm以上;(4)主动脉局部扩张6例,占54％。结论 CT扫描是检查主动脉夹层分离的无创伤技术,可以显示主动脉夹层分离的部位、范围以及并发症,能为主动脉夹层分离诊断提供明确依据。

Purpose To evaluate the plain, enhanced and dynamic enhanced CT scannings of aortic dissection for obtaining the correct diagnosis. Methods 11 cases of acute aortic dissection underwent pre - and post - contrast medium enhancemen CT scannings, including 4 cases dynamic enhanced imagings. Results All the characteristic CT findings in 11 cases of aortic dissection were shown as follows; 1. double lumen sign in 10 cases (90% ) . 2. intimal tear sign in 4 cases (36.6% ) with curvilinear negative intimal tearing flap shadow sign. 3. intralumen displacement of intimal calcification in 2 cases (18.1%) with 5mm. inward dispsacement of intimal calcification sited on the exterior aotic wall. 4. local dilatation of aorta in 6 cases (54% ). Conclusion CT scanning is a kind of non - invasive method of examination for aortic dissection. It possesses the capacity of showing the site, extent and complication of aortic dissection and provides the evidence for early diagnosis.