Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy . The cardiomediastinal and hilar contours are within normal limits . As compared to prior chest radiograph from ___ , there is redemonstration of bilateral moderatesized pleural effusions , slightly decreased in size on the left . Lung volumes remain decreased and there is mild bibasilar atelectasis . Upper lungs are clear . No pneumothorax is identified .
    OUTPUT:
    
Bilateral moderate sized pleural effusions , with slight improvement of left sided pleural effusion .