Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is top normal . The mediastinal and hilar contours are unremarkable . The pulmonary vascularity is normal . The lungs are clear . No pleural effusion or pneumothorax is present . There are mild degenerative changes of the thoracic spine . No acute osseous abnormalities are seen . There are no displaced rib fractures noted .
    OUTPUT:
    
No acute cardiopulmonary process .