[Surgical treatment of unroofed coronary sinus]

We have experienced four cases of unroofed coronary sinus. Three cases were partial forms and one case was a complete form. Two of them were successfully diagnosed before operation. Surgical viewpoints were discussed. In the absence of LSVC, the coronary sinus defect may be simply closed. In the cases with PLSVC, several types of repair were discussed. It has been reported that this defect is usually associated with simple or complex cardiac malformations, including tricuspid atresia or tetralogy of Fallot. In our case with TA, oversight of this anomaly before and during operation resulted in the urgent reoperation. A surgeon should always keep in mind this anomaly, even if the coronary sinus is not large.