Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right chest drain overlies the right mid hemithorax . No pleural effusion or pneumothorax . Small right chest wall emphysema relates to the chest tube placement . Upper lobe predominant emphysematous and bullous changes are redemonstrated . The cardiomediastinal and hilar contours are normal .
    OUTPUT:
    
Emphysema . No pneumothorax .