Endometriosis is a benign and common disorder that is characterized by ectopic endometrium
outside the uterus. Extrapelvic endometriosis, like of the vulva, is rarely seen. We report a case of a
47-year-old woman referred to our clinic due to complaints of a vulvar mass and periodic swelling
of the mass at the time of menstruation. During surgery, the cyst ruptured and a chocolate-colored
liquid escaped onto the surgical eld. The cyst was extirpated totally. Hipstopathological examination
showed ndings compatible with endometriosis. She was asked to follow-up after three weeks. The
patient had no complaints and the incision eld was clear at the follow-up.
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