Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged including very mild tortuosity of the thoracic aorta . The heart is normal in size . There are no pleural effusions or pneumothorax . The lungs appear clear . The chest is hyperinflated . A bulging contour to the left posterior diaphragm is consistent with a small Bochdalek hernia that was identified previously , and surgical clips are again present in the left upper quadrant . Bony structures are unremarkable .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease . Stable appearance of the chest .