Imaging diagnosis and differential diagnosis of a rare variants of interatrial communications by MSCT

KU Leizhi; XIONG Qingfeng; WANG Jie; ZHU Li; LIU Tianci; MA Xiaojing

Abstract：Objective To analyze the imaging diagnostic value of MSCT for a rare variants of interatrial communications.Methods A total of 13 patients with a rare variants of interatrial communications were retrospectively collected.The original Data of all patients were analyzed by using multi-plane reconstruction,maximum density projection,3D-volume rendering tech-nique.It mainly included channel shape,origin,passway,terminating point position,length and width.According to the chan-nel shape and length,it can be divided into three types:funnel-shaped,long tubular type(length≥20 mm),and short tubular type(length<20 mm).Results Among the 14 cases,3(21.43%)cases were funnel-shaped,4(28.57%)cases were long tubu-lar type,and 7(50.00%)cases were short tubular type.All 14 cases of variant interatrial channels originated from the upper wall of the left roof;11(78.5%)cases flowed into the superior vena cava draining into the right atrial orifice,and 3(21.43%)cases flowed into the right atrium.The average length of the channel was about(21.36±11.35)mm,and the width was about(2.0±0.67)mm;six(42.86%)of these cases were associated with cardiovascular malformations,including one(7.14%)each of right coronary artery arising from the left coronary sinus,left atrial anomalous fibromuscular cord,membraneous ventricular septal an-eurysm and coronary sinus ostial atresia;and there was two(14.29%)cases of left atrial diverticulum.Conclusion MSCT can clearly show the morphology,origin,passway and terminating point of a rare variants of interatrial communications,which is of great value in the imaging diagnosis and differential diagnosis of a rare variants of interatrial communications.