[Isolated communication between the left atrium and the coronary sinus (author's transl)].

The communication between the coronary sinus and the left atrium is a very exceptional case. In this work the AA. report the difficulties of the pre and peroperating diagnosis, above all because the coronary sinus, in this case, is not enlarged, but usual. The identification of the malformation, that is also isolated, is difficult also at the surgery, if you don't make a left atriotomy. A personal operative method of correction is reported.