Ovarian Endometriomas: Understanding “Chocolate Cysts”
A gentle guide to what they are, how they’re assessed and what to ask next.
Hearing that you have a “chocolate cyst” can leave you with more questions than answers. The nickname sounds unusual, but it simply refers to the dark, old blood inside an endometriosis-related ovarian cyst.
Here’s a gentle introduction to what an endometrioma is, how it may be assessed and what you can ask your care team.
What is an ovarian endometrioma?
An ovarian endometrioma is a cyst associated with endometriosis that forms in an ovary. Its wall contains endometriosis tissue, and the cyst holds old blood—giving it the appearance behind the name “chocolate cyst.”
It is one form of endometriosis. You can also have superficial or deep endometriosis elsewhere in the pelvis.
Is every ovarian cyst an endometrioma?
No. There are several types of ovarian cysts. Some develop as part of the menstrual cycle and often disappear on their own. An endometrioma is a different type, so it needs its own assessment and follow-up plan.
If someone has simply told you “there’s a cyst,” it’s okay to ask what type they think it is and how confident they are.
What might you notice?
Some people have pelvic pain, painful periods or discomfort during sex. Others find out about an endometrioma during an ultrasound, without having obvious symptoms.
Pain alone cannot tell you whether you have an endometrioma. Tell your clinician about symptoms that are new, changing or getting in the way of daily life.
How is it assessed?
A pelvic ultrasound is often used to look at a cyst’s size and appearance. An internal vaginal scan may be offered; you can discuss what the examination involves and what feels manageable for you.
Depending on the findings, your clinician may recommend repeat imaging, further tests or a gynaecology referral. Ask when your results will be reviewed and who to contact if symptoms change.
What are the treatment options?
There is no single plan for every endometrioma. Your symptoms, the cyst’s appearance and size, your age, previous treatment and fertility goals all help guide the conversation.
Monitoring: a plan to keep checking
Monitoring means arranging reviews and, when appropriate, repeat scans to look for changes. It should come with a clear plan: when the next appointment is, who will review the results and what symptoms should bring you back sooner.
You can still ask for help with pain while a cyst is being monitored. If symptoms are affecting daily life, tell your care team rather than waiting silently for the next scan.
Medicines: managing symptoms
Pain medicines and hormonal treatments may be offered to help with endometriosis symptoms. Examples of hormonal options include combined hormonal contraception and progestogen treatments.
The choice depends on your health, side effects and preferences, including whether you are trying to become pregnant. Ask what the medicine is expected to help with and how the cyst itself will be followed up.
Surgery: weighing benefits and risks
If surgery is recommended, it is often done by laparoscopy—keyhole surgery through small cuts in the abdomen. Ask whether the plan is to remove the cyst wall, a procedure called cystectomy, or use another approach.
The technique matters. Removing the cyst wall can reduce recurrence compared with draining the cyst and using heat to treat its lining, but protecting the ovary is also important. Ask why the proposed approach suits your situation.
Surgery on an ovary can reduce ovarian reserve—the remaining supply of eggs. Discuss the expected benefits, risks and alternatives, particularly if you have had ovarian surgery before.
What about fertility and ovarian reserve?
Having an endometrioma does not automatically mean you cannot become pregnant. If having children now or later matters to you, bring that up before treatment decisions. You can ask whether fertility advice would be useful.
You may hear about an AMH blood test or an antral follicle count on ultrasound. These help assess ovarian reserve and can inform fertility treatment planning.
They are not a simple pass-or-fail fertility test. An AMH result does not measure egg quality or, on its own, tell you whether you can become pregnant naturally. Ask how any result fits with your age, history and goals.
If IVF is being considered, removing an endometrioma first is not automatically helpful. Surgery may still be discussed for pain or access to eggs, so ask your fertility team how the options compare for you.
You do not need to decide everything in one conversation. You can ask for the plan to be explained again.
Can an endometrioma come back?
Yes, endometriomas can return after treatment. If you have surgery and are not trying to become pregnant straight away, your clinician may offer longer-term hormonal treatment to reduce the chance of recurrence.
Ask what follow-up will look like and what to do if symptoms return. Needing another review does not mean you have done anything wrong.
A few questions to take with you
“Does this look like an endometrioma or another type of cyst?”
“Do I need monitoring, and when should the next review happen?”
“What are we hoping each treatment option will help with?”
“If surgery is recommended, how could it affect my ovary and egg supply?”
“Would ovarian reserve testing or a fertility consultation help with planning?”
“What is the follow-up plan after treatment?”
“Which changes in symptoms mean I should seek help sooner?”
When to get urgent help
Seek urgent medical assessment for sudden, severe pelvic pain or abdominal pain with nausea or vomiting. A cyst can sometimes rupture or an ovary can twist; these symptoms need assessment rather than being assumed to be a usual endometriosis flare.
Support while you work out the next step
Medical terms can make an already tiring experience feel heavier. A short list of questions, a copy of your scan report and someone to talk things through with can help you feel more prepared.
Endometriosis Canada’s virtual peer support community offers space to connect with others who understand. Share what feels comfortable, or simply listen.
This article provides general patient education and does not replace personalised medical advice.
Sources and further reading
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