[Pleuropericardial cyst rupturing into the pericardium causing tamponade]. / Kyste pleuropéricardique fistulisé dans le péricarde avec tamponnade clinique.

Pleuropericardial cysts of the mediastinum are rare lesions, usually congenital but exceptionally acquired. They are often asymptomatic, but complications can occur. We report below the case of a 35-year-old man who presented with an acquired right-sided para-tracheal mesothelial cyst that ruptured into the pericardium and was responsible for clinical tamponade. Although the majority of mesothelial cysts are asymptomatic, only a strict clinical and radiological follow-up can provide an indication for surgical resection. This should be reserved for symptomatic patients or for those facing an uncertain diagnosis.