Endometriotic Cyst (Chocolate Cyst) of Ovary

Endometriosis is defined as the presence of endometrial glands and stroma outside the uterus. The most common site of involvement is ovary. The patients are usually of child-bearing age and present with infertility and cyclical pain associated with menstruation. Repeated bouts of hemorrhage may convert ovary into a cyst filled with brown material (chocolate cyst). Image courtesy of: Dr. Bulent Celasun, Ankara, Turkey. Used with permission.