血液可沿主动脉向上或向下剥离动脉。
这些数目字代表了动脉瘤并发症的终生风险，也就是一定大小的动脉瘤出现破裂或剥离的机率有多高。
These Numbers represent a lifetime risk of complication: the chance that an aneurysm of a given size will rupture or dissect, although the figures do not indicate when the crisis will happen.
为了评估这种危险的干预性手术是否值得，医生必须晓得患者的主动脉瘤出现 破裂或剥离的可能性有多大。
To assess whether such a dangerous intervention is warranted, a physician must know how likely it is that an aortic aneurysm will rupture or dissect.
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