Bilateral Origin of Pulmonary Artery From Homolateral Ductus Arteriosus

Abstract

In instances of congenital pulmonary stenosis associated with ventricular septal defect, anomalous origin of one pulmonary artery from the aorta by way of a ductus arteriosus, is occasionally observed. This report presents two rare cases, in each of which both pulmonary arteries arose from the aorta by way of its homolateral ductus arteriosus. Additionally, in each case the pulmonary trunk was absent and intracardiac malformations were present. In one case, involving a six-week-old girl, there was a basal ventricular septal defect above which the aorta arose. The aortic arch was left-sided. In the second case, an 11-year-old girl, the aorta arose mainly from the left ventricle above a basal ventricular septal defect. The ascending aorta was inverted, arching toward the left. The aortic arch passed over the right branches and showed mirror-image branching. The anomalous origins of the pulmonary arteries are considered a result either of failure of development or abnormal involution of the ventral portion of each sixth aortic arch.