Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size , allowing for low lung volumes . There is patchy calcification along the aortic arch . The mediastinal and hilar contours appear unchanged allowing for leftward rotation . The lungs appear clear . There are no pleural effusions or pneumothorax . A compression deformity along the mid - to - lower thoracic spine is not well demonstrated due to overlapping soft tissue structures , but is likely unchanged .
    OUTPUT:
    
No evidence of acute disease .