Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Postoperative changes of left upper lobectomy are noted with left - sided volume loss and elevation of the hilum . Left - sided chest tube remains in place . There is mild interval decrease in size of the left - sided pneumothorax seen at the apex and likely laterally . The lungs are otherwise clear . There is no large effusion or new consolidation . Cardiomediastinal silhouette is stable . No acute osseous abnormalities .
    OUTPUT:
    
Small residual left - sided pneumothorax with left - sided chest tube in place . No superimposed acute process .