Anomalous Drainage of Persistent Left Superior Vena Cava to the Left Atrium: Case Series and Literature Review.

Persistent left superior vena cava (PLSVC) draining into the coronary sinus is not uncommon, but to the left atrium is a rare condition. Such anomaly may be a cause of unexplained hypoxia in all age groups. It is often diagnosed accidentally during cardiovascular diagnostic work-up or in a contest of other cardiac investigations.