Anomalous Pulmonary Venous Drainage

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In our experience, anomalous pulmonary venous drainage associated with interatrial septal defects has been common. Of 100 patients operated on under direct vision for interatrial septal defect, 17 have had associated abnormal pulmonary venous drainage. Of these 17 cases, 15 had anomalous drainage from the right lung and 2 from the left lung. The 15 cases with anomalous drainage from the right lung can be further classified; 5 cases had anomalous drainage from the entire right lung into the right auricle; 7 cases had only partial anomalous drainage into the right auricle, while 3 cases had anomalous drainage into both right auricle and superior vena cava. In one case the anomalous drainage from the left lung was entirely into the coronary sinus; in the other it was into the right auricle. Usually, we have found that anomalous venous drainage of the right lung entered the right atrium just to the