Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged but unchanged . The aorta is slightly tortuous but unchanged . Mediastinal and hilar contours are stable . Pulmonary vasculature is normal . Lungs are clear . No focal consolidation , pleural effusion or pneumothorax is identified . No acute osseous abnormalities identified .
    OUTPUT:
    
No acute cardiopulmonary abnormality .