Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Catamenial pneumothorax ?
    ### Response:
    Catamenial pneumothorax is an extremely rare condition that affects women. Pneumothorax is the medical term for a collapsed lung, a condition in which air or gas is trapped in the space surrounding the lungs causing the lungs to collapse. Women with catamenial pneumothorax have recurrent episodes of pneumothorax that occur within 72 hours before or after the start of menstruation.
    