TNFRSF1A and abdominal aortic aneurysm: Total AAA incidence, quantified based on death before the end of the experiment due to a dissecting abdominal aortic aneurysm with presence of a retroperitoneal hematoma or, in the surviving mice, by the presence of a dissecting aneurysm in the suprarenal aorta with concomitant formation of a thrombus (Fig. 6B; b,c), was 23% in the p55+/+LDLR−/− group (3 mice out of 13) compared to 54% in the p55−/−LDLR−/− group (7 mice out of 13) (Fig. 6C; p = 0.22).