Study of Interventional Pulmonologic Treatment of Malignant Central Airway Stricture

Inclusion Criteria: * malignant neoplasm caused central airway stenosis * the degree of stenosis is above 50% * estimated survival duration is longer than 3 months * received no treatment one month before * can understand the statement informed consent * agree to enroll in the study Exclusion Criteria: * older than 70 years or younger than 18 years * not malignant neoplasm caused central airway stenosis * not central airway stenosis * existence of lumina collapse or twisting * severe arrhythmia, myocardial ischemia or hypertensive crisis * coagulation disorders * existence of severe organ disfunction * allergic to anesthesia drugs * refuse to participate the study