Transient idiopathic subpleural cysts in the newborn: an observation in two patients.

We present two cases of transient idiopathic cystic formations in the subpleural region in full-term newborns, that do not fit into any known cystic process to our knowledge. The features of the cystic formations, their subpleural location, their spontaneous regression, the histopathological study, as well as the absence of a clear etiology, have led us to propose the name of "Transient Idiopathic Subpleural Cysts in Full-term Newborns", for this process.