Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable supine view of the chest . Vagal nerve stimulator projects over the left chest wall with catheter extending to the left neck soft tissues , unchanged . Heart size is mildly enlarged . Lung volumes are low . No overt signs of pneumonia or edema . No large effusion or pneumothorax . The mediastinal contour is stable . No acute osseous injuries .
    OUTPUT:
    
No acute intrathoracic process