Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy and CABG . The cardiac silhouette size is normal . The mediastinal and hilar contours are unremarkable . The lungs are clear . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities . Mild degenerative changes are present within the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .