Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Decreased widening of cardiomediastinal contours with heart size currently within normal limits . Multifocal areas of atelectasis are again demonstrated , with interval improvement in the right upper lobe , but slight worsening at both retrocardiac regions . Bilateral small pleural effusions are probably unchanged . No visible pneumothorax . Subcutaneous emphysema in the chest wall has partially improved .
    OUTPUT:
    
1 . Improved mediastinal widening , which was likely post-operative and projectional in etiology . 2 . Worsening bibasilar atelectasis and persistent small bilateral pleural effusions .