Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Left chest wall vagal nerve stimulator again seen with leads extending into the left neck . Lung volumes are low limiting assessment though allowing for this the lungs are clear . The heart is normal in size . The aorta appears unfolded as on prior . No large effusion or pneumothorax . Imaged osseous structures are intact .
    OUTPUT:
    
No acute intrathoracic process .