Overriding aortas are congenital heart defects in which the aorta is situated directly superior to a ventricular septal defect (VSD) rather than the normal position (i.e. left ventricle). As a result, the amount of oxygenated blood received by the aorta for distribution to the body is reduced. If left untreated, this can lead to cyanosis. Overriding aorta seldom occurs on its own and is one of the four conditions comprising tetralogy of Fallot.
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