Normally the heart is located in the middle part of the thorax, in dextrocardia it is located in the right half of the thorax due to a congenital alteration and generally accompanied by situs inversus (the organs are on the opposite side of where they should be)
In transposition of the great arteries, there is an abnormal arrangement of the major blood vessels, the superior and inferior vena cava, the pulmonary artery, the pulmonary veins, and the aorta.