Prasanna Lokadolalu Chandracharya, Thomas Huban R, Das Aswin, Kumar Rakesh
Associate Professor, Department of Anatomy, Kasturba Medical College, Manipal University , Manipal, India .
Senior Grade Lecturer, Department of Anatomy, Kasturba Medical College, Manipal University , Manipal, India .
J Clin Diagn Res. 2016 May;10(5):AD03-5. doi: 10.7860/JCDR/2016/17785.7821. Epub 2016 May 1.
Persistent Left-side Superior Vena Cava (PLSVC) is the congenital central venous anomaly draining into the right atrium in 82-90% of cases via coronary sinus produce no haemodynamically significant consequences. In few cases it may drain into the left atrium directly or through the pulmonary veins resulting in right to left shunt. During routine undergraduate dissection, we found a PLSVC formed by the union of left subclavian and left internal jugular veins behind the left sternoclavicular joint was terminated into the right atrium through a larger coronary sinus ostium. Before its termination, PLSVC received a left hemiazygos vein formed by the continuation of the superior and inferior hemiazygos veins. A larger but thin communicating vein was noted between the right superior vena cava and PLSVC. Prior knowledge about such variations is essential in all the intervention procedures on right atrium through the left subclavian approach and also like in our case, the larger coronary sinus ostium if found during transthoracic echocardiography should be considered as an indication for the diagnosis of PLSVC.
永存左侧上腔静脉（PLSVC）是一种先天性中心静脉异常，82% - 90%的病例经冠状窦汇入右心房，不产生血流动力学显著影响。少数情况下，它可能直接汇入左心房或通过肺静脉汇入，导致右向左分流。在本科常规解剖过程中，我们发现一条由左锁骨下静脉和左颈内静脉在左胸锁关节后方汇合形成的PLSVC，通过一个较大的冠状窦口汇入右心房。在其汇入之前，PLSVC接收了一条由上半奇静脉和下半奇静脉延续形成的左半奇静脉。在右上腔静脉和PLSVC之间发现了一条较大但较细的交通静脉。对于所有通过左锁骨下途径对右心房进行的干预操作而言，了解此类变异的相关知识至关重要，同样，就像我们的病例一样，如果在经胸超声心动图检查中发现较大的冠状窦口，应将其视为诊断PLSVC的一个指征。
