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 partly calcified . The mediastinal and hilar contours appear unchanged . There is a convex contour to the right upper mediastinum , but shown to reflect tortuosity of the innominate artery on the neck CT from the same day and similar to the earlier chest radiographs . Streaky opacity in the lingula suggests atelectasis . Elsewhere , the lungs appear clear . There are no pleural effusions or pneumothorax . Slight degenerative changes are similar along the thoracic spine .
    OUTPUT:
    
No evidence of acute disease .