Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Aortic calcifications at the knob . Cardiomediastinal silhouette and hilar contours are normal . Re - demonstration of mild elevation of the left hemidiaphragm . Biapical lucencies correspond to emphysema . Lungs otherwise clear . No effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Emphysema .