Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The aorta shows moderate unfolding . The arch is calcified . A convex contour to the right upper mediastinum is most often due to tortuosity of the great vessels . The right hemidiaphragm is moderately elevated . There is no pleural effusion or pneumothorax . The lungs appear clear . Mild degenerative changes are noted along the mid thoracic spine .
    OUTPUT:
    
No evidence of acute disease .