Persistent left superior vena cava (PLSVC) connected to the left atrium.

A persistent left superior vena cava draining into the left atrium was diagnosed in an adult patient, scheduled for surgical correction of a large inferiorly located sinus venosus atrial septal defect. In the majority of cases a persistent left superior vena cava is found incidentally and causes little or no symptoms. Nevertheless, anaesthesiologist should be aware of its occurrence; because of different technical difficulties and clinical problems that can be encountered. Echocardiography plays an key role in the detection of a persistent left superior vena cava.