Abstract
Two cases of truncus arteriosus in infants are reported. In the first case the circulation to the lungs was by way of the bronchial arteries and cyanosis was intense. In the second case the pulmonary arteries arose directly from the aorta; consequently, there was adequate circulation to the lungs and cyanosis was absent.In both cases the contour of the heart in the left anterior oblique position was identical. In each instance the right ventricle extended out abruptly from the aorta to the anterior chest wall as a shelf. At autopsy the structures of the ventricles and their relation to the truncus arteriosus were found to be identical. Therefore, the author believes that this contour is characteristic of a truncus arteriosus in infancy in which the ventricles are normally formed and in which the aorta over-rides the ventricular septum and receives blood from both ventricles.
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