Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size remains mildly enlarged . The aorta remains tortuous . The mediastinal and hilar contours are otherwise unremarkable . The pulmonary vasculature is not engorged . The lungs are clear . No pleural effusion or pneumothorax is demonstrated . Mild degenerative changes are seen in the thoracic spine . Clips from prior cholecystectomy are demonstrated in the right upper quadrant of the abdomen .
    OUTPUT:
    
No acute cardiopulmonary abnormality .