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胸主动脉瘤是由于各种原因造成的主动脉一处或多处向外膨出，出现的像“瘤子一样”的改变。胸主动脉瘤指的是发生在主动脉窦、升主动脉、主动脉弓或降主动脉的动脉瘤，是退行性变，胸部主动脉部分异常扩张，变形，呈瘤样突出。
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