Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Streaky lucencies are noted in the base of neck and mediastinum consistent with pneumomediastinum . No radiopaque foreign body is seen . The lungs are clear and well expanded . Heart size is normal . Bony structures are intact .
    OUTPUT:
    
Pneumomediastinum . No radiopaque foreign body .