Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The mediastinal and hilar contours appear within normal limits . The lungs appear clear . Lung volumes are mildly low . There is no pleural effusion or pneumothorax . Small anterior osteophytes are noted along the anterior aspect of the lower thoracic to mid thoracic spine . Prior healed right posterior sixth , seventh and eighth rib fractures are noted .
    OUTPUT:
    
No evidence of acute disease .