Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Status post prior median sternotomy and mitral annuloplasty . Moderate right pleural effusion is smaller . Overlying atelectasis is present . A small left pleural effusion also persists . No pneumothorax identified . The size of the cardiomediastinal silhouette is unchanged .
    OUTPUT:
    
Interval decrease in size of the moderate right pleural effusion .