has part has part characteristic of inheres in towards has modifier Abnormal aortic morphology Overriding aorta Dextroposition of aorta UMLS:C0265886 An overriding aorta is a congenital heart defect where the aorta is positioned directly over a ventricular septal defect, instead of over the left ventricle. The result is that the aorta receives some blood from the right ventricle, which reduces the amount of oxygen in the blood. It is one of the four conditions of the Tetralogy of Fallot. The aortic root can be displaced toward the front (anteriorly) or directly above the septal defect, but it is always abnormally located to the right of the root of the pulmonary artery. The degree of override is quite variable, with 5-95% of the valve being connected to the right ventricle. Overriding aortic valve UMLS:C0011818 HP:0002623 SNOMEDCT_US:63934006 Fyler:1432 abnormal overlap with aorta interventricular septum membranous part