Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There has been some improvement in the extent of volume loss and opacification of the right middle lobe but to a large extent the lobe remains collapsed . There has also been mild improvement in posterior basilar opacities .
    OUTPUT:
    
Mild improvement in opacification of right middle lobe and posterior lower lobes .