2岁患儿，高热，体温39-400C，频咳，喘憋5天住院。査体：精神弱，面色苍灰，口周青，呼吸60次/分，左肺呼吸音低，叩诊浊音，少许细湿啰音。血常规：白细胞8.8X109/L，N0.44,异型淋巴细胞0.01,L0.45。X线胸片示左下肺大片状阴影。2天后患儿呼吸困难加重。X线胸片：左下胸呈密度均匀影，上界呈弧形，左肋膈角消失。该患儿合并有

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