Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged but unchanged . Mediastinal and hilar contours are within normal limits . Pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is present . No acute osseous abnormalities detected . Mild to moderate degenerative changes are noted in the thoracic spine . Clips are noted in the right upper quadrant of the abdomen compatible with prior cholecystectomy .
    OUTPUT:
    
No acute cardiopulmonary abnormality .