患者，男，30岁。30分钟前被刀刺伤右前胸部，咯血痰，呼吸困难。体检:血压107/78mmHg,脉搏96次/分，右前胸有轻度皮下气肿，右锁中线4肋间可见3cm长创口，随呼吸有气体进出伤口响声。患者纵隔的位置是

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