Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours are unremarkable . The lungs are mildly hyperexpanded but clear , without pneumothorax , vascular congestion , or pleural effusion .
    OUTPUT:
    
Mild pulmonary hyperexpansion is nonspecific and could be seen in the setting of asthma . Otherwise no acute process .