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Fig. 4B. —2-month-old boy with heterotaxy, dextrocardia, visceral situs inversus, single right ventricle, pulmonary atresia, total pulmonary venous return to right innominate vein, and bilateral "absent" pulmonary arteries. Angiogram of aortic arch shows patent right ductus arteriosus from base of right innominate artery supplying right intrapulmonary pulmonary artery and stenosis (arrow) at their junction. Large tortuous left ductus arteriosus (arrowhead) from underside of aortic arch supplies left intrapulmonary pulmonary artery. Bilateral absence of extrapulmonary pulmonary arteries is evident.