Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged , unchanged . The mediastinal and hilar contours are similar . The pulmonary vasculature is not engorged . Biapical scarring is unchanged , and the lungs are without focal consolidation . No pleural effusion or pneumothorax is seen . Minimal patchy atelectasis is noted in the lung bases . There is no subdiaphragmatic free air . Moderate multilevel degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality . No subdiaphragmatic free air .