Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been no significant interval change in the moderate amount of pneumomediastinum seen with air noted to track superiorly into the fascia planes of the neck as well as within the right superior chest wall . The cardiac , mediastinal and hilar contours are otherwise unremarkable . The lungs are clear . No pleural effusion or pneumothorax is present . No acute osseous abnormalities are identified .
    OUTPUT:
    
No interval change in the extent of pneumomediastinum .