Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been placement of an external wound VAC placed at the inferior sternal margin . There is otherwise little change compared to prior examination with stable cardiomediastinal silhouette and sternal wires remaining in place . Minimal bibasilar atelectasis remains unchanged . The remainder of the lungs are clear . There is no large effusion or pneumothorax .
    OUTPUT:
    
Little change compared to prior examination with placement of an external inferior sternal wound VAC .