Transposition of Great Arteries_A7955

**Transposition of Great Arteries** The primary pathology in this infant involved the cardiac malformations, the most severe being pulmonary atresia. The origin of the pulmonary artery has been repaired with large patch of pericardium. Aorta ascends normally, curves to the left without identifiable ductus. The right brachiocephalic divides abnormally high (above right clavicle) into the right subclavian and right common carotid. The right ventricular outflow tract is created by intact stitching of pericardial patch to juncture with each major pulmonary artery. Pinpoint lumens which are less than 1 mm internal diameter and therefore not probe patent either forward or backward. Huge high membranous ventricular septal defect 1.5 cm wide by 1 cm high with overriding aorta is noted.