The aortic arch is the first major arterial dissection through which blood flows out of the left ventricle and represents the alignment of the aorta. Protrusion of the aortic arch is often considered as the following: 1. 3, aortic coarctation, aortic coarctation is the blood flowing through the aorta when the coarctation occurs, flowing into the middle muscle layer, often accompanied by abdominal pain, etc.; 4, tumor spread, tumor spread occupying local compression can also appear when the aortic arch protrusion.