Assertion: catamenial pneumothorax | /r/HasProperty | a condition of air
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text: Catamenial pneumothorax is a condition of air leaking into the pleural space (pneumothorax) occurring in conjunction with menstrual periods (catamenial refers to menstruation), and or during ovulation, believed to be caused primarily by endometriosis of the pleura (the membrane surrounding the lung or diaphragm).