Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . The left cardiac border is obscured which usually indicates opacity in the lingula , but this appearance is fairly similar to the prior examination and probably represents minor scarring or atelectasis of doubtful significance . There is no pleural effusion or pneumothorax . There is similar mild relative elevation of the anteromedial right hemidiaphragm . The patient is also status post incompletely characterized lower anterior cervical fusion .
    OUTPUT:
    
No evidence of acute disease .