Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: One AP single chest view has been obtained with patient in upright position . Comparison is made to the next preceding similar study of ___ . Findings are grossly unchanged demonstrating again markedly reduced lung volume in the left hemithorax with marked shift of the mediastinal structures towards the left , indicating volume reduction , probably caused by chronic infections with large bronchiectatic changes on the bases as well as in the apical left upper lobe area . The right lung is hyperinflated . A previous preoperative chest examination of ___ is reviewed , compared with today 's findings . The dense bronchiectatic changes and scarring in the left hemithorax is grossly unaltered . When comparing the hyperinflated right lung , comparison demonstrates that there exists some new mostly linear changes in the right lung base that did not exist previously . Comparison with the next preceding single view chest examination of ___ demonstrates grossly unchanged findings as these linear densities existed already on the right base at that time .
    OUTPUT:
    
Stable - appearing left - sided chronic bronchiectatic changes . Basal right - sided mostly linear densities in supradiaphragmatic position existed on ___ and are unchanged now . It is very difficult to come to a conclusive diagnosis on a single view examination , particularly since we only have AP single view portable images available . Followup examinations during treatment would possibly demonstrate that the now identified linear densities resolved .