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