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Pneumomediastinum without pneumothorax (chest x-ray)

Chest x-ray upon admission to the emergency department demonstrates pneumomediastinum without pneumothorax (solid arrows). (Source: Morales G, Fiero M, Albert J, Di Gennaro J, Gerbino A. Cerebral arterial gas embolism due to helium inhalation from a high-pressure gas cylinder. Case Rep Emerg Med 2022;2022. Creative Commons Attribution 4.0 International License [CC BY 4.0].)

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