Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate unremarkable cardiomediastinal and hilar contours . Relative hyperlucency of the upper lungs compared to lung bases suggests underlying emphysema . Prominence of the bibasilar interstitium , right greater than left , may reflect chronic changes exaggerated by lower lung volumes ; however , given background emphysema superimposed mild edema can not be excluded . No pleural effusion or pneumothorax present . Mild apical thickening is not significantly changed compared to ___ . Redemonstration of surgical segmental resection of fifth right rib .
    OUTPUT:
    
Prominence of bibasilar interstitium on the background of chronic lung disease may be exaggerated by low lung volumes , though superimposed mild edema can not be excluded .