Lewa żyła główna górna uchodząca do lewego przedsionka

A rare congenital anomaly of superior vena cava characterized by a persistent left superior vena cava that drains into the left atrium through a direct connection to its roof, creating a right-to-left shunt. Patients are at risk of developing chronic hypoxia, decreased exercise tolerance, cyanosis, embolic cerebrovascular events, and heart failure.