Fourteen previously reported cases of atresia of the coronary sinus ostium, in which the coronary venous flow entered the right atrium by a persistent left superior vena cava, the innominate vein, and the right superior vena cava, are reviewed and two new cases reported. The first new case was in a 43 year old woman with atypical chest pains in whom investigations for suspected ischaemic heart disease, including coronary arteriography, yielded normal results. She died suddenly from massive myocardial infarction due to extensive old thrombotic occlusion of a major coronary artery without any appreciable underlying disease of the vessel wall. Exercise testing is considered to be advisable in symptomatic patients with normal coronary angiograms and attention to the venous phase might be informative. The second new case occurred in a child with an atrial septal defect and complete transposition of the great arteries, who died aged 1 month.
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