Bedside demonstration of the absence of the right pulmonary artery in a premature baby.

Bedside demonstration of the absence of the right pulmonary artery was made in a premature baby in the neonatal intensive care unit. Antegrade venous and retrograde aortic injections of contrast material excluded the possibility of the anomalous origin of the right pulmonary artery from the aorta, and suggested the above-mentioned diagnosis, with the addition of a ventricular septal defect and a right-to-left shunt.