Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval improved aeration of the left mid and upper lung , with persistent left lower lung opacity , likely a combination of pleural effusion and left lower lobe collapse . The appearance of the right hemithorax is unchanged , with multiple right rib fractures , moderate pleural effusion , and basilar atelectasis . No new opacities are identified in the right lung . .
    OUTPUT:
    
Improved aeration of the left upper and midlung since the prior study . Right hemi thorax is unchanged .