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 calcified . A convex contour to the right uppermost mediastinal contour is most commonly due to tortuosity of the great vessels . There is no pleural effusion or pneumothorax . The lungs appear clear . Mid thoracic interspaces are mildly narrowed .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .