Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs demonstrate significant improvement in bilateral middle and lower lung zone opacities ; however , these are not completely resolved . There is no new opacity , pleural effusion , pulmonary edema , or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
Bilateral mid and lower lung zone opacities persist but are significantly improved from prior radiograph .