Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . There is similar slight unfolding of the thoracic aorta . The mediastinal and hilar contours appear unchanged . The lungs appear clear . There are no pleural effusions or pneumothorax . Small osteophytes are noted along the lower thoracic spine .
    OUTPUT:
    
No evidence of acute disease .