Fig. 1

Thoracic computed tomography (CT) scan before and after treatment. A Axial mediastinal window of the chest CT scan taken before the procedure, showing a mass on the left main bronchus. B Axial mediastinal window of the chest CT scan taken 2 months after radiotherapy and chemotherapy, showing no visible mass. C Axial lung window of the CT scan taken before the procedure, showing segmental atelectasis of the left lung. D Axial lung window of the chest CT scan taken 2 months after radiotherapy and chemotherapy, showing no pulmonary mass. E Coronal mediastinal window of the chest CT scan taken before the procedure, showing a mass on the left main bronchus. F Coronal mediastinal window of the chest CT scan taken 2 months after radiotherapy and chemotherapy, showing no pulmonary mass