Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . There is mild unfolding of the thoracic aorta . The heart is again at the upper limits of normal size . The lung volumes are low . Streaky left basilar opacities are consistent with minor atelectasis . Otherwise , the lungs appear clear . There are no pleural effusions or pneumothorax . Small anterior osteophytes are similar along the mid - to - lower thoracic spine . There has been no significant change .
    OUTPUT:
    
No evidence of injury .