Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are stable . A right - sided PICC terminates in the mid SVC . Widespread infiltrative pulmonary opacities are stable from the prior exam . New from the prior study is extensive subcutaneous gas seen in the bilateral chest walls and involving the neck . There is pneumomediastinum . No large effusion or pneumothorax is identified .
    OUTPUT:
    
Persistent bilateral pulmonary opacities are unchanged . New from the prior exam is extensive subcutaneous gas seen in the chest wall and involving the neck . There is pneumomediastinum without any evidence of pneumothorax .