Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . Patchy calcification is similar along the aortic arch . Lungs appear clear . There is no pleural effusion or pneumothorax . Small anterior osteophytes are noted along the mid - to - lower thoracic spine . The bones are probably demineralized to some degree .
    OUTPUT:
    
No evidence of acute disease .