Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . There is mild unfolding of the thoracic aorta . The arch is partly calcified . The mediastinal and hilar contours are otherwise unremarkable . There is no pleural effusion or pneumothorax . The lungs appear clear . Mild rightward convex curvature is centered along the mid lumbar spine .
    OUTPUT:
    
No evidence of acute disease .