Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: This radiograph demonstrates markedly improved aeration compared to the study from 6 hr previously . While the right hemidiaphragm continues to be elevated , there is improved aeration in the retrocardiac region with only minimal volume loss in the left lower lobe . There is a new small area of atelectasis / infiltrate in the right mid lung laterally .
    OUTPUT:
    
Improved aeration of the left lower lobe without left lower lobe infiltrate . New area of increased opacity in the right mid lung laterally .