Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well - expanded and clear . The heart is not enlarged . There is no pneumothorax , pleural effusion , or consolidation . The CTA of the neck performed subsequently demonstrates pneumomediastinum . In retrospect , areas that appear more radiolucent are seen , especially on the lateral view , consistent with pneumomediastinum .
    OUTPUT:
    
1 . No pneumothorax . 2 . Pneumomediastinum is better assessed on CTA of the neck performed after this study .