Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs remain mildly hyperexpanded reflecting COPD . Mild bibasilar atelectasis has progressed . The heart is not enlarged . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Slight worsening of bibasilar atelectasis . 2 . COPD . No acute cardiopulmonary abnormality .