Fig. 3

a Bronchoscopy findings. After performing successful bronchial occlusion using a fibrin glue sealant and polyglycolic acid sheet, the bronchial fistula is closed. The white arrows indicate that the fistula was covered with granulation tissue. b The negative-pressure wound therapy (NPWT) system. The technique entails placing a wound sponge on the fenestrated wound, sealing the site with an adhesive drape, and applying negative pressure at 80 mmHg