Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs show severe left lower lobe opacity with an associated effusion . The right lung shows a small effusion . A right subclavian catheter terminates with its tip in the right atrium . An NG tube terminates with its tip overlying the mid mediastinum .
    OUTPUT:
    
1 . NG tube should be advanced by 20 cm for optimal position . 2 . Unchanged severe left lower lobe atelectasis with an associated effusion . These findings were communicated via telephone to ___ via telephone at 3 :36 p .m . on ___ .