Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged but unchanged . Mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is present . Mild degenerative changes are noted within the lower thoracic spine . No radiopaque foreign bodies are visualized .
    OUTPUT:
    
No acute cardiopulmonary abnormality . No radiopaque foreign body .