Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates interval placement of a right - sided chest tube with subsequent significant improvement in large right - sided pleural effusion . A small persistent right - sided pleural effusion is present . No definite pneumothorax is identified . Right - sided atelectasis is present . No other change seen .
    OUTPUT:
    
1 . Status post right - sided chest tube placement with some improvement seen in right - sided pleural effusion .