Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . There is mild unfolding and calcification along the aorta . The mediastinal and hilar contours appear unchanged . The lungs appear clear . There are no pleural effusions or pneumothorax . Mild degenerative changes are noted along the mid to lower thoracic spine .
    OUTPUT:
    
No evidence of acute disease .