Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . There are minimal atherosclerotic calcifications of the aortic knob . Lungs are clear and the pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . There is minimal biapical scarring . Mild degenerative changes are noted within the thoracic spine . Clips are noted from prior cholecystectomy within the upper abdomen .
    OUTPUT:
    
No acute cardiopulmonary abnormality .