Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unchanged , with calcification of the aortic knob again noted . Pulmonary vasculature is normal . Lungs remain hyperexpanded . No focal consolidation , pleural effusion or pneumothorax is seen . There are multilevel degenerative changes in the spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .