Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: ONE AP PORTABLE UPRIGHT VIEW OF THE CHEST . A previously seen cavity in the left lung is no longer present . In that location , there are linear interstitial opacities likely from fibrosis from scarring in that area or may represent pneumonia . Mild bibasilar atelectasis . The mediastinal and hilar contours are normal . There is no pneumothorax . There are low lung volumes .
    OUTPUT:
    
1 . Linear opacities in the left mid lung may represent residual scarring from prior cavitary lesion or could represent new pneumonia . 2 . Right basilar atelectasis .