Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are slightly hyperexpanded , similar to the prior study with lucent areas , predominantly at the apices , suggesting emphysema . The heart is not enlarged . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . There is no pulmonary edema .
    OUTPUT:
    
Emphysema , but no evidence of acute cardiopulmonary abnormality .