Biodegradable Stents in the Management of Stenoses of the Large Airways

Inclusion Criteria: * significant large airway stenoses * benign tracheobronchial stenosis of any origin in participants who can not go for surgery, or who refuse surgical treatment * benign tracheobronchial stenoses of any origin when the surgery is planed after some delay, benign tracheobronchial stenoses when the effect of anti- inflammatory or anti-infective treatment is expected * malignant tracheobronchial stenoses due to extrinsic compression when exhausted curative modalities * malignant stenoses from extrinsic compression in participants undergoing the actinotherapy or receiving systemic anticancer therapy Exclusion Criteria: * stenoses of any origin which can be treated primarily surgically * stenoses caused by intraluminal growth of tumor, tracheoesophageal or bronchoesophageal fistulas * pregnancy