Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . There is mild tortuosity of thoracic aorta . There is no pleural effusion or pneumothorax . The lungs appear clear . Mild degenerative changes are noted along the lower thoracic interspaces . The left acromioclavicular joint appears widened with smooth but irregular ends . This appearance is likely to be chronic .
    OUTPUT:
    
No evidence of acute disease . Widening of the left acromioclavicular joint , not fully characterized but suspected to be chronic ; clinical correlation is suggested .