Coronary sinus septal defect. Surgical considerations.

The coronary sinus septal defect is an uncommon anomaly. If it is not suspected, found, and repaired at operation, a residual intracardiac shunt will result. The defect usually is associated with a left superior vena cava (LSVC), which necessitates special consideration in the conduct of cardiopulmonary bypass. Our recent treatment of three cases of coronary sinus septal defect stimulated us to review the embryology, anatomy, diagnosis, and surgical treatment of this malformation.