Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to chest radiograph from earlier today , persistent veil like opacity of the left hemithorax has not substantially changed . Support devices remain in standard position . Right lung remains clear . Cardiomediastinal contours are unremarkable . Increasing retrocardiac opacity likely atelectasis . Increasing subcutaneous air in the left chest wall .
    OUTPUT:
    
Persistent left pleural effusion . New left lower lobe atelectasis and subcutaneous emphysema , left chest wall .