Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP upright view of the chest was provided . The vagal nerve stimulator is again seen projecting over the left lower hemithorax , with catheter extending into the left neck . Lung volumes are low which limits evaluation . Mild interstitial edema may be present , though technique and low lung volumes limit evaluation . There is no focal consolidation , effusion , or pneumothorax . The cardiomediastinal silhouette is stable . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Equivocal for mild interstitial edema . Otherwise , no acute findings .