Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral view of the chest shows interval improvement of right base ventilation due to reduced atelectasis , but residual small pleural effusion . The focal opacity described in chest x-ray of ___ over the spine has resolved , was likely an atelectasis . Left lung is clear and fully expanded . No pneumothorax . Cardiomediastinal silhouette is normal .
    OUTPUT:
    
Interval improvement of right base ventilation with reduced atelectasis , but residual small pleural effusion .