The aortic sinus is the lumen of the aortic duct at the root of the ascending aorta corresponding to the aortic valve that expands outward to form three spherical lumens with upward openings, also called the sinuses of the aorta. The aortic sinuses are divided into left, right and posterior sinuses, and according to the presence or absence of coronary artery openings are divided into right coronary sinus, left coronary sinus and no coronary sinus, the left and right coronary artery openings are often located in the left and right coronary sinuses, most of which are located in the center of the coronary sinus. The aortic wall of the aortic sinus is relatively thin, and the thickness of the arterial wall in the aortic sinus is approximately half the thickness of the aorta. The structure of the aortic sinus facilitates the outward expansion of the aortic sinus and reduces the pressure of blood on the aortic valve when the aortic valve is closed. The disadvantage is the thinning of the skin of the aortic sinus wall, which tends to form aneurysmal dilatation of the aortic sinus.