Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Thin curvilinear opacities projecting on either side of the cardiac silhouette are compatible with pneumomediastinum . On the lateral view , air is seen along the anterior aspect of the upper abdomen . The heart size is normal . Pulmonary vasculature is unremarkable . The lungs are clear without focal or diffuse abnormality . No emphysema is noted . No pleural effusion or pneumothorax . No radiopaque foreign bodies . Osseous structures are unremarkable .
    OUTPUT:
    
Pneumomediastinum . Findings were discussed with Dr . ___ by ___ via phone call on ___ at 12 :55 p .m . , at the time of discovery of findings .