PLEUROPERICARDIAL and pleurocoelomic are synonymous terms applied to a thin-walled cystic structure, typically lying on or near the diaphragm in the right cardiophrenic space. Attempts have been made to classify pleuropericardial cysts with other simple cysts of the pleura; however, their mode of origin and location appear to be specific, and they are, therefore, assigned to a separate category.
Pleuropericardial cysts must have a much higher incidence than is evidenced by the infrequency with which they have been reported. Johnson1 stated that he supposed the reason few reports of these cysts appear in the literature is that they are of so little significance in themselves that surgeons seldom feel them worthy of discussion. So far as the patient is concerned this may be true, but from the viewpoint of the chest physician the establishment of the diagnosis is not always simple, and, until definitely classified, a pleuropericardial cyst can