Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right - sided chest tube is unchanged in position . Mediastinal and hilar contours are unchanged . There is mild tortuosity of the aorta which is unchanged . Again , there is minimal bibasilar atelectasis . There is no appreciable pneumothorax or pleural effusion .
    OUTPUT:
    
1 . Minimal bibasilar atelectasis . 2 . Right chest tube unchanged with no evidence of pneumothorax .