Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A moderate left upper pneumothorax is again demonstrated . The left thoracostomy tube is unchanged in position . There remains a small left pleural effusion . There is slight rightmediastinal shift . The heart size is top normal . The hilar mediastinal contours for are stable . There has been interval slight improvement of previously seen right pulmonary edema . Otherwise the radiograph is unchanged in comparison to the 15 :33 study .
    OUTPUT:
    
1 . Unchanged known moderate - sized left pneumothorax . 2 . Unchanged position of a left - sided chest tube . 3 . Interval improvement right pulmonary edema .