Purpose of this presentation is to describe etiology and pathophysiology of pneumomediastinum, pneumothorax and subcutaneous emphysema, and illustrate the imaging fittures.Materials and Methods: For a period of 5 years (2012-2017), 124 traumatic patients have undergone, examined and proved through an emergency department of the University Hospital. In each of these studies, at least two imaging methods were performed to allow even minimal injuries.Results and discussion: All of these patients have undergone, examined and proved through an Emergency and Diagnostic Imaging departments of the University Hospital. The obtained results were -in 37 patients' pneumothorax, 64-pneumomediastinum, 23 subcutaneous emphysemas. Spontaneous pneumothorax/SP/, occurs in 24 patients without underlying pulmonary disease. Conclusion:Therefore, it is possible to find amount of gas in mediastinum, pleural cavity and subcutaneous tissues in many different cases; as demonstrated, these conditions could be concurrent or isolated. Radiologist must know these conditions and, most of all, recognize the degree of severity and the onset of complications.