Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The aortic arch is partly calcified . The mediastinal , hilar contours appear unchanged . The chest is mildly hyperinflated . There is no pleural effusion or pneumothorax . The lungs appear clear . Suspected bony demineralization and mild thoracic spinal degenerative changes are similar .
    OUTPUT:
    
No evidence of acute disease .