However, endometriosis can occur very rarely in postmenopausal women. An estimated 2%-4% of endometriosis cases are diagnosed in
the postmenopausal period. In
endometriosis, the endometrium (from endo, "inside", and metra, "womb") is found to be growing outside the uterus, on or in other areas of the body. Normally, the endometrium is shed each month during the menstrual cycle; however, in endometriosis, the misplaced endometrium is usually unable to exit the body.