Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post recent median sternotomy and cardiovascular surgery . Cardiomediastinal contours are stable in the post-operative setting . As compared to the recent radiograph , there has been improved atelectasis in the left mid and both lower lungs , with a residual patchy and linear foci of atelectasis remaining . Small bilateral pleural effusions are also present , but there is no evidence of pneumothorax .
    OUTPUT:
    
Improving multifocal atelectasis . Small pleural effusions .