When a woman has chocolate cysts (which are more formally known as endometriomas), the condition, like oyster ovaries, can mean infertility.

Larger lesions may be seen within the ovaries as ovarian endometriomas or "chocolate cysts", "chocolate" because they contain a thick brownish fluid, mostly old blood.

An endometrioma, endometrioid cyst, endometrial cyst, or chocolate cyst of ovary is a condition related to endometriosis.

Complications of endometriosis include internal scarring, adhesions, pelvic cysts, chocolate cyst of ovaries, ruptured cysts, and bowel and ureteral obstruction resulting from pelvic adhesions.