Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . Mild pneumomediastinum and pneumoperitoneum is present . There is subcutaneous gas overlying the base of the neck . There is no pneumothorax , focal consolidation , or pleural effusion .
    OUTPUT:
    
Mild pneumomediastinum and pneumopericardium with subcutaneous gas tracking along the neck base .