Pneumoretroperitoneum secondary to pneumomediastinum in a child with coronavirus disease 2019

Pneumomediastinum is a known complication of mechanical ventilation. Infrequently, it secondarily arises from pneumoperitoneum or pneumoretroperitoneum, when air travels along the fascial planes to enter the mediastinum. Conversely, pneumoretroperitoneum secondary to pneumomediastinum is even rare but could occur in mechanically ventilated patients.