A chocolate cyst, also known as an ovarian endometrioma, is a fluid-filled sac that forms on the ovary because of endometriosis. Endometriosis is when the endometrium grows outside the uterus, causing pain and discomfort. Chocolate cysts are so named because of their dark, reddish-brown appearance due to the presence of old blood. Understanding and addressing chocolate cysts is crucial, as they can cause severe pain, impact fertility, and reduce the quality of life for women affected by them ... Chocolate cysts are noncancerous, fluid-filled cysts that typically form deep within the ovaries. They get their name from their brown, tar-like appearance, looking something like melted... Discover what chocolate cysts are, their common symptoms, causes, and available treatment options. Learn how these ovarian cysts can affect women's health and steps to manage them effectively. Chocolate ovarian cyst: Ovarian endometrioma means cysts on ovaries filled with tissue similar to the uterine lining. Learn more about the symptoms, causes and treatment of ovarian endometrioma here.