Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Surgical clips at the left hilum are unchanged in position . The heart size is top - normal . The hilar and mediastinal contours are unchanged . A Left thoracostomy tube is unchanged at the left base . Again seen is a moderate left pneumothorax , stable over the past prior 2 radiographs . A small left pleural effusion is also unchanged . Mild right pulmonary edema is stable .
    OUTPUT:
    
1 . Known left moderate sized pneumothorax is unchanged over the past 2 radiographs from today . 2 . Unchanged small left pleural effusion . 3 . Unchanged position of the left thoracostomy tube . 4 . Stable mild right pulmonary edema .