Unroofed coronary sinus syndrome: diagnosis, classification, and surgical treatment

Unroofed coronary sinus syndrome (URCS) is a rare cardiac anomaly in which a communication occurs between the coronary sinus and the left atrium as a result of the partial or complete absence of the roof of the coronary sinus. This entity is strongly associated with a persistent left superior vena cava (LSVC), with or without a connection between both superior venae cavae.1 The diagnosis of this lesion is important to the prognosis of the...