Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The aortic arch is partly calcified . The mediastinal and hilar contours appear unchanged . The lungs appear clear . There are no pleural effusions or pneumothorax . Several mild - to - moderate compression deformities are noted along the thoracic spine , probably chronic , although new since the prior radiographs .
    OUTPUT:
    
No evidence of acute disease . Several chronic - appearing mild - to - moderate compression deformities along the thoracic spine , suggesting a sequela of bony demineralization .