Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . The endotracheal tube is seen with its tip residing 2 .3 cm above the carina . The endogastric tube descends into the left upper quadrant . A left chest wall pacer device is noted with leads extending to the region of the right atrium and right ventricle . Retrocardiac vague linear densities are noted which could reflect atelectasis though difficult to exclude a component of aspiration . Otherwise the lungs appear grossly clear . No definite signs of effusion or pneumothorax . No signs of congestion or edema . The cardiomediastinal silhouette appears within normal limits allowing for technique . Bony structures appear intact .
    OUTPUT:
    
Tubes positioned appropriately . Minimal linear opacity in left lower lung likely atelectasis , difficult to exclude a component of aspiration .