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Chest computed tomography of the patient. (a) Free air in the soft tissues of the neck, subcutaneous emphysema, and air in epidural space of cervical vertebra. (b) Subcutaneous emphysema in the soft tissues of the left hemithorax and anterior chest wall as well as mediastinal emphysema surrounding mediastinal structures. (c) Free air surrounding mediastinal vascular structure and subcutaneous emphysema. (d) Pneumopericardium and air in the epidural space of the thoracic vertebra.
