Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . The mediastinal and hilar contours are within normal limits . The pulmonary vascularity is normal and the lungs are clear . No pleural effusion or pneumothorax is visualized . No displaced rib fractures are noted . There are no acute osseous abnormalities . Multi level degenerative changes are seen in the thoracic spine
    OUTPUT:
    
No acute traumatic injury identified .