[Total anomalous pulmonary venous return into the coronary sinus. Apropos of 1 case with a difficult diagnosis and surgical success].

The case of an 8 year-old boy with total anomalous pulmonary venous return into the coronary sinus is reported. The coronary malformation comprised a considerable dilatation of the coronary sinus which made diagnosis very difficult even at open heart. The surgical success was obtained by resecting the interatrial septum and partitioning the atrium. The anatomical diagnosis of this condition and the malformations with which it could be confused are discussed: TAPVR into the right atrium, cor triatriatum. The two parts of the coronary sinus, confluence of the cardiac veins and the left horn of the sinus venosus, are described.