Pneumomediastinum is the presence of free air in the mediastinum. It is rarely seen in children. The causative reason cannot be found in most cases. Here, we present two cases with pneumomediastinum who presented with the complaint of chest pain. Pneumomediastinum was suspected because of the insufficient imaging of mediastinal structures at the suprasternal window during echocardiography in both of these patients. The free air image can sometimes not be detected sometimes at direct graphy as in our first case. Patients suspected of having pneumomediastinum must therefore always be reevaluated by computed tomography if the direct films are normal.

Keywords: Child, Chest pain, Spontaneous pneumomediastinum