What is type A and B Aortic Dissection?

would you be able to tell us the difference between type A and type B aortic dissection? So type A aortic dissection is a tear between the inner surface of the aorta and the other layers of the aorta. There is a tear in the so-called intima and there is a blood flow to a false lumen and there is a false channel where the blood is flowing in. So type A aortic dissection means that this happens in the ascending part of the aorta, which is the part of the aorta that is going directly out of the heart. So type A aortic dissection is a life-threatening event that needs immediate surgery by a cardiac surgeon and that can only be done with cardiovascular support and that is not treated conservatively. Type B aortic dissection is a dissection that happens after the branches that are going to the brain have left the aorta. So it all happens in the descending, so in the part that is going down after the aortic arch. And type B dissection is typically treated conservatively and in some cases needs an operation, typically thoracic endovascular aortic repair if complications occur.