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| pretracheal space (位于气管和气管前筋膜之间，向下通上纵隔。气管前间隙的感染可扩散至上纵隔。该间隙内有甲状腺下静脉、甲状腺奇静脉丛和气管前淋巴结等，偶尔有甲状腺最下动脉和头臂干。小儿还有胸腺上部) | |||
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