Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral view of the chest shows interval improvement of lung base ventilation for reduced atelectasis and pleural effusion . Persistent mild right middle lobe opacity probably due to residual atelectasis . Flattening of diaphragm and mild hyperlucency of the upper lobes is due to mild COPD changes . Cardiomediastinal silhouette is normal . There is no pneumothorax .
    OUTPUT:
    
Interval improvement of right lung base opacity and resolution of pleural effusion with residual right middle lobe atelectasis .