这个词是什么意思？
An abnormal balloon- or sac-like dilatation in the wall of the THORACIC AORTA. This proximal descending portion of aorta gives rise to the visceral and the parietal branches above the aortic hiatus at the diaphragm.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D017545 · MeSH 2026。
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