Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right small pneumothorax has slightly improved from ___ .5 to ___ .7 mm . An air - fluid level is seen in the right basal pleura . Air overlying the right mediastinum is probably compatible with a gastic pull up in this patient with esophageal cancer . Bibasal atelectasis is slightly improved . Left lung is unremarkable .
    OUTPUT:
    
Right small pneumothorax has slightly improved .