Anomalies of the pulmonary veins, particularly of the isolated type, constitute one of the rare groups of congenital cardiac defects. Such examples as have been reported can be classified into (1) anomalies in number, (2) anomalies in drainage and (3) anomalies in number and drainage. Of most practical interest are those anomalies of the pulmonary veins which involve a variation in drainage. Instead of terminating in the left atrium, one or more of the pulmonary veins may empty into remnants of the fetal circulation (left superior vena cava, ductus venosus), the systemic veins (superior vena cava, inferior vena cava, azygous, innominate and subclavian veins), the portal system, the right atrium or the coronary sinus.
At present, the available literature yields only 3 cases1 of anomalous drainage of all the pulmonary veins into the coronary sinus as a primary developmental lesion. Because of this rarity I wish to record the