Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest . No prior . There is evidence of pneumomediastinum along the left side of the heart and tracking up in the superior mediastinum and soft tissues of the neck . Extensive subcutaneous gas seen overlying the right greater than the left chest wall . The lungs are grossly clear . There is no definite pneumothorax . There is no definite focal consolidation . Cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
Pneumomediastinum with significant subcutaneous gas extending into the neck and chest wall , right greater than left . No visualized pneumothorax .