Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . Mild unfolding of the thoracic aorta and calcification . The mediastinal and hilar contours appear otherwise within normal limits . There is no pleural effusion or pneumothorax . Mild degenerative changes are noted along the thoracic spine , and the bones appear demineralized .
    OUTPUT:
    
No evidence of acute disease .