In three patients traumatic pulmonary pseudocysts were observed. In one the cause was a barotrauma due to hyperbaric oxygenation with positive end-expiratory pressure. In the other two an accident was the cause. Expectant management is always indicated because in most cases there is spontaneous regression, as long as there are no important complications. In ventilated patients mean and peak pressure values should be as low as possible.
Capeder, Frutiger, Gartmann, Wülser, , , , , (1984). [Traumatic pulmonary pseudocysts]. Deutsche medizinische Wochenschrift (1946), 1984 Jul;109(28-29):1116-21. https://www.ncbi.nlm.nih.gov/pubmed/6378570