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Pneumothorax is a condition that describes the presence of air between the visceral and parietal pleura sheets and the consequent collapse of the lungs. The collapse of the lungs can be partial or total and can present in different clinical stages, such as a high-pressure pneumothorax that can cause a mediastinal shift. Pneumomediastinum is the presence of free air between the mediastinal tissues due to various causes. It can manifest spontaneously and be minimally symptomatic but can also develop due to severe complications. Its etiology includes numerous iatrogenic and traumatic factors. Although spontaneous pneumothorax and pneumomediastinum that develop in childhood are similar to adult patients, it is important to determine the appropriate treatment strategy in addition to the age group, the effectiveness of the treatment, the role of the applied treatment in reducing recurrence, and the etiologyoriented treatments if there is an underlying pathology., Competing Interests: Conflict of Interest: The authors declared no conflicts of interest with respect to the authorship and/or publication of this article., (Copyright © 2024, Turkish Society of Cardiovascular Surgery.)