Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The ___ radiograph from 17 :48 shows increased near - complete opacification of the left hemithorax . Two left chest tubes remain in place . The aerated right lung is grossly clear . The heart and mediastinum can not be accurately assessed . The followup radiograph from 20 :23 shows slightly increased gaseous distension of the stomach , and no other significant interval change . The ___ radiograph shows decreased gaseous distention of the stomach , and no other relevant change .
    OUTPUT:
    
Increased near complete opacification of the left hemithorax , which is likely due to a combination of worsening atelectasis or increased large pleural effusion .