Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . Attenuation of upper lung markings and a large suspected bulla in the right upper lung suggest emphysema . There is again widespread scarring in the lower lungs bilaterally with a very similar pattern . The lungs are hyperinflated . There is no pleural effusion or pneumothorax . There has been no definite change .
    OUTPUT:
    
Stable appearance of the chest . Sequela of tuberculosis is not excluded regarding lung opacities . The pattern suggests stable scarring probably related to emphysema and prior infections . ___ , MD , PhD