The pathology change aggravate gradually with postradiation time extension, pulmonary alveolus is the main damage location.

其病理改变随着照射后时间延长逐渐加重，肺泡是主要受损部位。

Objective To explore the effect and survival time by setting covered metallic expansible-self stents to treat postradiation esophago-tracheal fistula.

探索放置金属带膜自膨式支架治疗放疗后食管气管瘘的功效及生存时间。