Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The right - sided mediastinal stripe is mildly widened . Although this appearance is most often due to tortuosity of the great vessels , prior studies are not available to show stability . The lungs appear clear . There are no pleural effusions or pneumothorax . Moderate degenerative changes involve the acromioclavicular joint .
    OUTPUT:
    
No evidence of acute disease . Relatively wide right - sided paratracheal stripe , probably a normal variant , but if correlation with prior films is not available to show long - term stability , then a chest CT is recommended to assess further .