[Endometriosis and diaphragmatic defect in catamenial pneumothorax].

Two cases of catamenial pneumothorax are reported, a rare condition characterized by its sudden occurrence in a female patient between the ages of 30 and 40 years, always at the onset of the menstrual cycle. Its exact origin is unknown, but the frequent co-existence of endometriosis and a defect in the diaphragm suggests that endometriosis may be important in the etiology both of the pneumothorax and the diaphragmatic lesion. Pelvic endometriosis was present in both our patients, one of whom also had diaphragmatic endometriosis. The treatment of the pneumothorax in both our cases consisted of pleural decortication with excellent results so far.