Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The bibasilar opacities have improved since ___ . No new areas of focal consolidation are visualized . Small left pleural effusion is unchanged from the prior study . There is no pneumothorax . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
1 . Interval improvement in the bibasilar opacities , which may represent improving infection or atelectasis . 2 . Stable small left pleural effusion .