Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lower lung volumes seen on the frontal exam with secondary bibasilar atelectasis . There is a persistent moderate left pleural effusion with which may have marginally increased since prior . Superiorly , the lungs are clear . There is no pneumothorax . Cardiomediastinal silhouette is grossly stable noting lower lung volumes .
    OUTPUT:
    
Mild increase in size of the moderate left sided pleural effusion