Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of the cardiac silhouette is relatively unchanged from the previous study . Mediastinal and hilar contours are unremarkable . Lungs are clear . Pulmonary vasculature is normal . No pleural effusion or pneumothorax is demonstrated . No acute osseous abnormality is clearly visualized .
    OUTPUT:
    
No acute cardiopulmonary abnormality .