Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided chest tube appears unchanged . There is persistent unchanged subcutaneous emphysema which has redistributed somewhat . Endobronchial valves appear unchanged along the left hilum . There is persistent extensive atelectasis of the left upper lobe with mild volume loss in the left hemithorax . There is a trace left - sided pleural effusion although not necessarily changed in degree allowing for differences in positioning .
    OUTPUT:
    
Extensive left upper lobe atelectasis and trace pneumothorax on the left . Left - sided chest tube in place . Widespread subcutaneous emphysema .