Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . The lungs appear clear . The chest is hyperinflated somewhat . Degenerative changes and very mild loss in height among two lower thoracic vertebral bodies appear unchanged and likely of long chronicity .
    OUTPUT:
    
No evidence of acute disease .