Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear , although hyperexpanded evidenced by flattening diaphragms . Cardiac size is normal . Hilar contours are unremarkable . There is no pleural effusion , pneumothorax , pneumonia .
    OUTPUT:
    
1 . No evidence of acute cardiopulmonary process . 2 . COPD .