Transposition of the Great Arteries (TGA)

Transposition of the Great Arteries (TGA) [transposition=switch the order, great arteries=the aorta & the pulmonary artery] the positions of the great vessels are switched so that the aorta (which carries oxygen-rich blood to the body) is closer to the oxygen-poor blood AND the pulmonary artery (which carries oxygen-poor blood to the lungs) is closer to the oxygen-rich blood.  It is usually accompanied by a hole in the wall between the ventricles (ventricular septal defect or VSD).