Figure 50-25 A, Influence of aortic size on the cumulative lifetime incidence of natural complications of an aortic aneurysm. On the y axis is plotted the incidence of natural complications (rupture or dissection); on the x axis, aortic size is plotted. This plot is for the ascending aorta. Note the hinge point at 6 cm. B, The same plot for the descending aorta. Note the hinge point at 7 cm.