Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Cardiomediastinal silhouette and hilar contours are normal . Lungs are clear . Lungs appear hyperexpanded with apical lucency gradient . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
Emphysema . No pneumonia or pulmonary edema .