Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Inspiratory volumes are low . The heart is not enlarged . Aorta is unfolded . Mild prominence of the mediastinum is likely accentuated by low inspiratory volumes . There is upper zone redistribution , without overt CHF . Bibasilar atelectasis . No effusions . No pneumothorax detected .
    OUTPUT:
    
Low inspiratory volumes , but doubt acute pulmonary process . Upper zone redistribution and bibasilar atelectasis noted . If clinically indicated , PA and lateral views could help for more detailed assessment .