Catamenial pneumothorax is a recurrent pneumothorax temporally associated with menstruation. Pathogenesis remains debated however pleural endometriosis or diaphragmatic abnormalities are almost always present. We report the case of a 35-year-old woman with recurrent right catamenial pneumothorax. At thoracoscopy a large laceration of the diaphragm with partial intrathoracic liver herniation was seen. Treatment involved repair of the diaphragmatic lacerations, and pleurodesis. This report shows that large diaphragmatic defects may be observed in patients with catamenial pneumothorax.
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