男性，68岁。查体：心底部有舒张期哈气样 杂音，以胸骨右缘第2肋间最响，第二心音亢 进，血压22. 6/12_0kPa( 170/90mmHg)。胸片 示主动脉增宽，扭曲，心影靴形。最可能的 诊断是

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