Résumé : Two cases are reported of abnormal venous pulmonary drainage of the upper left lobe into the trunk of the left innominate vein. This type of malformation is relatively rare. When this is the only malformation it is usually not diagnosed as the shunt to which it gives rise is very small. Usually the anomaly is discovered at the time of catheterization to investigate an associated cardiopathy and is confirmed by angiography. Treatment is relatively simple. It consists of disinsertion of the drainage vein from the innominate trunk and its anastomosis with the left auricle.