Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is a vagal stimulator device that projects over the left chest wall with the catheter extending to the left neck region . Again , the lung volumes are quite low , which may limit the evaluation in the bases . There is evidence of bibasilar atelectasis . The mid upper lungs are clear . There is no effusion or pneumothorax . The heart and mediastinal contours are stable .
    OUTPUT:
    
No acute changes to suggest interval development of pneumonia .