Final answer:
Chocolate cysts, also known as endometriomas, are ovarian cysts resulting from endometriosis and can affect fertility and cause pelvic pain.
Step-by-step explanation:
Another name for chocolate cysts is endometriomas. These are a specific type of ovarian cyst formed due to endometriosis, which is a condition wherein the tissue that normally lines the inside of your uterus grows outside the uterus. When endometrial tissue forms a cyst on the ovary, it can become filled with old blood that resembles chocolate, hence the name 'chocolate cysts'. These cysts can cause pelvic pain and can affect fertility.