Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . The ascending aortic contour is convex , and there is also mild unfolding along the descending thoracic aorta . The heart appears normal in size . Minimal opacification at the lung bases is consistent with very minor atelectasis . Otherwise , the lung fields appear clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Unfolding of the thoracic aorta . No evidence of acute disease .