Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . Mediastinal and hilar contours are normal . Lungs are clear . Pulmonary vascularity is normal . No pleural effusion or pneumothorax . Mild degenerative changes in the thoracic spine are noted . Clips are seen within the right upper quadrant compatible prior cholecystectomy .
    OUTPUT:
    
No acute cardiopulmonary abnormality .