Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates repositioning of a left - sided chest tube now with pigtail . The recently seen large left pneumothorax has decreased significantly in size . Small right pleural fluid is not well identified on plain film . Again seen are changes associated with emphysema .
    OUTPUT:
    
Improvement in large right pneumothorax .