Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild unfolding of the thoracic aorta is similar to somewhat increased over the long interval , although it may be exaggerated by low lung volumes . The heart is normal in size . There is also new mild relative elevation of the left hemidiaphragm compared to the right side . However , the lungs appear clear , and there is no evidence for pleural effusion or pneumothorax . Degenerative changes along the thoracic spine are mild and not significantly changed .
    OUTPUT:
    
No evidence of acute disease or injury .