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[Diaphragmatic pseudocyst of the pleuro-peritoneal membrane (pseudocyst of Bracket's membrane at the site of Bochdalek's orifice). Apropos of a case].

After surgical exeresis of a large diaphragmatic cyst located at the Bochdalek orifice and with predominating endoabdominal extension, the pathological examination revealed it to be a pseudocyst involving the pleuroperitoneal Bracket membrane. This pseudocyst may have resulted from defective development of the primary lymphatic system of the pleuroperitoneal folds or of the pleuroperitoneal membrane. According to this hypothesis, myoblastic colonization of the membrane which gives the posterior part of the diaphragm would have been interrupted. The only clinical sign of this pseudocyst is a heavy painful feeling. Diagnosis is made on the basis of echography and tomodensitometry. Treatment to date is strictly surgical with very satisfactory outcome and no cases of mortality.