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 . There is mild unfolding along the lower descending thoracic aorta . Slight biapical pleural scarring is stable . The lungs appear otherwise clear . There is no pleural effusion or pneumothorax . Mild degenerative changes are similar along the mid - to - lower thoracic spine . A pectus deformity is present .
    OUTPUT:
    
No evidence of acute disease .