二尖瓣闭锁的MRI诊断

目的 分析二尖瓣闭锁（MA）的病理改变和MRI表现，方法 回顾分析5例经手术证实MA的MRI表现，并与心血管造影（CAG）比较，结果 显示了3型MA的病理改变：双心室左侧房室瓣无孔1例，右室型单心室左侧房室无连接3例，以及左室型单心室左侧房室瓣无孔1例，主要合并畸形有：房间隔膨出瘤1例，全肺静脉异位引流心上型1例，左肺动脉缺如1例及肺动脉狭窄4例，5例行右室和（或）右房造影，除1例外均难以显示MA解剖结构，结论 MRI在MA的诊断中有一定的临床应用价值。

MRI diagnosis of mitral atresia

Objective To analyse the pathologic changes and MRI appearances of mitrial atresia (MA). Methods MRI appearances of 5 cases with MA confirmed by operation were reviewed and compared with angiocardiography (CAG). Results MRI demonstrated the pathologic characteristics of three types of MA according to the traditional classification:biventricular hearts with imperforate mitral valve (1 case),univentricular heart of right ventricular type with absent left atrioventricular connection (3 cases) and univentricular heart of left ventricular type with imperforate mitral valve (1 case).MRI still provided anatomic information of associated anomalies including mainly aneurysms of atrial septum (1 case),total anomalous pulmonary venous drainge into superior vena cava (1 case),absent left pulmonary artery (1 case) and pulmonary stenosis (4 cases). The right atrial and(or) ventricular angiocardiograms in the 5 cases could not display the anatomic morphology of the malformation,with exception of one case only. Conclusion MRI is valuable in diagnosis of MA.