Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Emphysema is seen with an upper lung predominance . There is minimal bibasilar scarring and / or atelectasis . The lungs are otherwise clear . Both costophrenic angles are excluded from this study , although there are no definite pleural effusions . No pneumothorax is seen . The cardiac and mediastinal contours are normal .
    OUTPUT:
    
1 . No acute cardiac or pulmonary process . 2 . Emphysema .