Results On plain film, ME appeared as a line or lamellar radiolucent shadow;on HRCT, it clearly displayed as gas density shadow and gas-drawing-up mediastinal structure.

• 结果X线平片显示纵隔气肿呈线条状或片状透亮影，HRCT清晰显示气肿呈气体密度影和被气体勾画出的纵隔结构。