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，是主要受损部。

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

探索放置金属膨式支架治疗放疗后食管气管瘘的功效及生存时间。