Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again noted is extensive subcutaneous air , similar to that seen previously . Previously noted pneumomediastinum and right apical pneumothorax appear relatively stable . Right middle lobe segmental collapse and previously noted lingular opacity have improved .
    OUTPUT:
    
1 . Improved right middle lobe segmental collapse and lingular opacity . 2 . Right apical pneumothorax and pneumomediastinum appear stable .