Congenital Heart Disease on the Web - Ventricular Septal Defect Ventricular Septal Defect Angiogram shows a markedly dilated main pulmonary artery and some opacification of the aorta. Films show mild cardiomegaly, a rather large pulmonary artery segment, and basically normal peripheral pulmonary vasculature.
Differential diagnosis lies mainly between pulmonary stenosis and pulmonary hypertension.
Lateral film showing a large right pulmonary artery strongly suggests pulmonary hypertension.