Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mild to moderately enlarged . The aorta is tortuous . The mediastinal and hilar contours are unremarkable . Lungs are slightly hyperinflated with flattening of the diaphragms suggestive of COPD . Atelectasis is noted in the lung bases without focal consolidation . No pleural effusion or pneumothorax is present . No acute osseous abnormality is identified .
    OUTPUT:
    
Possible COPD . Bibasilar atelectasis .