Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are noted to be hyperexpanded with flattening of the hemidiaphragms . Redemonstrated is linear , bibasilar scarring versus atelectasis . There is no focal consolidation , pleural effusion , pneumothorax , or pulmonary edema identified . The heart size is normal . Mediastinal and hilar contours are normal .
    OUTPUT:
    
No radiographic evidence of acute cardiopulmonary process . Mild to moderate emphysematous changes .