Definitions:
Catamenial : Menstrual
Catamenial pneumothorax: A condition of collapsed lung occurring in conjunction with menstrual
periods (catamenial refers to menstruation), believed to be caused primarily by endometriosis of the
pleura (the membrane surrounding the lung).
Catamenial Hemopneumothorax: When endometrial cells attach to the lung, release blood which
accumulates to large levels, and air moves in through fenestrations in the diaphragm by an unknown
mechanism causing the lung to collapse.
Catamenial Hemothorax: The accumulation of blood without lung collapse.
Catamenial Hemoptysis: Coughing up blood from the respiratory tract during menstruation because of
intrathoracic endometriosis. Endometrial cells have moved into the tracheo-bronchial tree