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Cardiac causes of respiratory distress. (A) Respiratory distress in a newborn due to patent ductus arteriosus with radiographic features of mild cardiomegaly (dotted arrow) and increased pulmonary vascular markings (arrowhead) due to shunt vascularity. (B) Term neonate with changes of volume overload: cardiomegaly (dotted arrow) and interstitial edema (arrow) due to ventricular septal defect
