Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs the chest demonstrate significant interval improvement in bilateral parenchymal opacities . There is only mild persistent opacity in the right lower lung . The cardiomediastinal and hilar contours are unremarkable . There is no pneumothorax or pleural effusion . There is no free air under the right hemidiaphragm .
    OUTPUT:
    
1 . Significant interval improvement in bilateral parenchymal opacities , with only mild persistent opacity in the right lower lung . 2 . No free air under the right hemidiaphragm .