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are caused by trauma or iatrogenic interventions, and to the best of our knowledge, only 17 cases associated with bronchial asthma have been reported in the literature up to February 2012. The mechanism by which this condition is considered to develop is the exfoliation of transudative air in the posterior mediastinum space due to high bronchoalveolar pressure, and the subsequent invasion of the epidural space. Epidural emphysema rarely causes neurological symptoms and improves spontaneously with conservative treatment in most cases [1, 2] . A 22-year-old man with an asthma attack was transported by ambulance to our emergency room. He had a past history of asthma but had not received a medical examination regularly. He complained of severe dyspnea, coughing and upper chest pain for several days. On admission, he showed severe hypoxia requiring supplemental oxygen at a rate of 6 liters/min, but no neurological symptoms. Chest computed tomography (CT) showed pneumomediastinum and radiolucent space in the spinal canal suggesting epidural emphysema ( fig. 1 ). He received conservative treatment for bronchial asthma including a corticosteroid and bronchodilator for 3 days, whereupon his symptoms improved. The follow-up CT 7 days later revealed that the air in the epidural space and mediastinum had disappeared. Epidural emphysema, which shows the presence of air in the spinal epidural space, is a rare entity. Most cases Published online: May 23, 2012

A Case of Bronchial Asthma Complicated by Epidural Emphysema