Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Analysis is performed in direct comparison with the next preceding similar study of ___ . Heart size and mediastinal structures unchanged . The previously identified basal pleural densities that obliterate the right - sided lateral pleural sinus has further regressed ; some pleural thickening remains . Previously still identifiable contours of the chest tube tract have now resolved completely . Apically located air bubbles in the pleural space have also resolved and an apparent pleural scar cap has developed without evidence of any active pulmonary or pleural abnormalities . Overall appearance of rather advanced emphysematous pulmonary changes persist . No evidence of new pulmonary infiltrates or vascular abnormalities . The previously remaining small amounts of air pockets in the right axillary area have now resolved completely .
    OUTPUT:
    
Development of scar formations , but no evidence of new pulmonary or pleural abnormality . General impression of advanced emphysema persists .