An unusual systemic venous drainage pattern was found in a 30-year-old man with ostium secundum atrial septal defect and pulmonary stenosis. He had the rare association of absent right superior vena cava, persistent left superior vena cava draining into the coronary sinus, and a left-sided inferior vena cava draining into a left superior vena cava through the hemiazygous vein.
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