How do chocolate cysts form?
Chocolate cysts are noncancerous, fluid-filled cysts in the ovaries of patients suffering from endometriosis. The name is derived from a brownish appearance, similar to melted chocolate. They’re also called endometriomas or endometriotic cysts.
The color comes from old menstrual blood and tissue that fills the cavity of the cyst. It can involve one or both ovaries.
Chocolate cysts occur in 20 to 40 percent of women who have endometriosis.
