aortic aneurysm
noun [ C ] medical specialized uk/eɪˌɔː.tɪk ˈæn.jə.rɪ.zəm/ us/eɪˌɔːr.t̬ɪk ˈæn.jɚ.ɪ.zəm/
主动脉瘤
a dangerous swelling of the wall of the aorta (= the body's largest artery)
Less than half the people with ruptured aortic aneurysms survive. 主动脉瘤破裂的病人只有不到一半的存活率。