Lucas, SusanaRamos, Helena2020-10-192020-10-192020http://hdl.handle.net/10400.1/14783Pneumomediastinum is defined as the presence of air in the mediastinal cavity. Can be classified into two categories: secondary pneumomediastinum, when there is a causative etiological factor and spontaneous pneumomediastinum, without a clear etiology.engjournal article10.22546/57/1907