Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . There is mild unfolding of the thoracic aorta . The mediastinal and hilar contours are otherwise unremarkable . The lungs appear clear . There is no pleural effusion or pneumothorax . The patient is status post incompletely characterized lower cervical fusion .
    OUTPUT:
    
No evidence of acute disease .