Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size , mediastinal and hilar contours are normal . The lungs appear slightly over expanded , but are grossly clear . There are no pleural effusions or pneumothoraces .
    OUTPUT:
    
1 . No radiographic evidence of pneumonia . 2 . Hyperexpanded lungs , which may reflect a vigorous inspiratory level . In the appropriate clinical setting , obstructive airways disease such as asthma should also be considered .