Atresia of the coronary sinus ostium with persistent left superior caval vein.

We describe a case of a 33-year-old woman with congenitally corrected transposition where computed tomography angiography incidentally detected ostial atresia of the coronary sinus with dilatation of the terminal parts of the middle cardiac vein and great cardiac vein and retrograde drainage of the coronary sinus into the persistent left superior caval vein, the intercommunicating vein, then to the right superior caval vein, and ultimately into the right atrium.