Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The aortic contour is mildly prominent , but not significantly changed , perhaps reflecting slight ectasia along the arch or upper descending aorta . The lungs appear clear . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
No evidence of acute disease . Similar slight prominence of the aortic arch contour , better evaluated on CT of the same day , but without change .