Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged with tortuosity of the thoracic aorta . Hilar contours are unremarkable . Biapical scarring is moderate greater on the right with rightward mediastinal shift ; possibly representing the sequelae of prior TB . There is loss of parenchymal architecture in the upper lung fields suggestive of emphysema . Lungs are otherwise clear . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality . No evidence of active tuberculous involvement . Emphysema .