Introduction
A persistent left superior vena cava (PLSVC) is the most common thoracic venous anomaly that is caused by the remnant of the left cardinal vein, an embryological vessel, that is present during the early developmental period [1]. The incidence of PLSVC is between 0.3 and 2% in individuals with a normal heart and about 8% in those with a concomitant congenital heart disease [2]. PLSVC carries coronary sinus blood retrogradely into the left innominate vein, and in most cases, it drains into the right atrium through the coronary sinus in the absence of congenital heart disease [3]. When the coronary sinus receives a left superior vena cava or a hepatic vein, it is enlarged [4]. This venous anomaly is mostly asymptomatic and is encountered incidentally during cardiac device implantation, surgery or cardiovascular imaging [5].