Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of the cardiac silhouette is stable . The mediastinal and hilar contours are unchanged . The pulmonary vascularity is normal . The lungs are clear . No pleural effusion or pneumothorax is demonstrated . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality .