A chocolate cyst, also called an endometrioma, is an ovarian cyst filled with old blood caused by endometriosis. If you are planning IVF, current international guidance recommends against routinely removing an endometrioma just to improve IVF outcomes, because surgery has not been shown to improve live birth and may reduce ovarian reserve. Surgery can still be appropriate for selected women when there is a specific reason. 12 - Chocolate Cyst (Endometrio…

The Decision That Can Be Made Too Quickly

You may have an ultrasound report that says “endometrioma” or “chocolate cyst”, followed by a recommendation for surgery.

Before making that decision, there is an important question to ask:

What is the surgery expected to achieve, and what could it cost in terms of ovarian reserve?

An endometrioma is attached to ovarian tissue. Removing the cyst can therefore also affect healthy ovarian tissue. For someone who is planning pregnancy, that potential impact needs to be considered carefully. 12 - Chocolate Cyst (Endometrio…

This is particularly important if you are considering IVF treatment or already have a reduced ovarian reserve.

What Is a Chocolate Cyst?

A chocolate cyst is an endometrioma, a type of ovarian cyst associated with endometriosis.

Endometriosis occurs when tissue similar to the uterine lining grows outside the uterus. When this tissue affects an ovary, it can bleed during menstrual cycles. The blood accumulates inside the cyst and becomes darker and thicker over time, producing the characteristic “chocolate” appearance. 12 - Chocolate Cyst (Endometrio…

A chocolate cyst is therefore not simply an ordinary ovarian cyst. It is associated with endometriosis and may occur alongside other forms of endometriosis.

For a broader explanation, read our guide on Endometriosis and Fertility: From Diagnosis to IVF.

How Is an Endometrioma Diagnosed?

Transvaginal Ultrasound

Transvaginal ultrasound is usually the main imaging test.

An endometrioma can have a characteristic appearance on ultrasound, often described as having uniform low-level internal echoes or a “ground-glass” appearance. An experienced operator can often identify it reliably. 12 - Chocolate Cyst (Endometrio…

MRI

MRI may be used when ultrasound findings are unclear or when deeper endometriosis needs to be mapped.

What About CA-125?

CA-125 is not a diagnostic test for endometriosis and should not be used by itself to diagnose the condition. 12 - Chocolate Cyst (Endometrio…

Your doctor will also consider whether the cyst has typical features. Changes in its appearance, unusual characteristics or development after menopause may require a different evaluation.

Why Does Surgery Affect Ovarian Reserve?

This is one of the most important parts of the decision.

Research cited in the source found that AMH fell by an average of 1.13 ng/mL after endometrioma removal, with larger falls in women who initially had better ovarian reserve. 12 - Chocolate Cyst (Endometrio…

Surgery can affect the ovary because healthy ovarian tissue may be removed along with the cyst wall. Heat used to control bleeding can also affect surrounding tissue.

This is why ovarian reserve should be considered before deciding on surgery.

If you already have low AMH, you may also want to read Can You Get Pregnant with AMH Below 1?.

Should an Endometrioma Be Removed Before IVF?

Not routinely.

The ESHRE guideline cited in the source gives a strong recommendation against routinely performing surgery for ovarian endometrioma before assisted reproduction simply to improve live birth rates. The evidence has not demonstrated a live-birth benefit, while surgery may negatively affect ovarian reserve. 12 - Chocolate Cyst (Endometrio…

That does not mean surgery is never appropriate.

It means that the presence of an endometrioma by itself is not necessarily a reason to operate.

When Can Surgery Be Appropriate?

Surgery may still be considered when there is a specific clinical reason.

1. Significant Pain

If endometriosis-related pain is severe and cannot be adequately controlled through other approaches, surgery may be considered as part of pain management. 12 - Chocolate Cyst (Endometrio…

2. The Cyst Blocks Access to Follicles

During IVF, eggs need to be collected from the ovaries.

If a large endometrioma physically obstructs access to the follicles, surgery may sometimes be considered to make egg collection possible or safer. 12 - Chocolate Cyst (Endometrio…

3. Diagnostic Uncertainty

If the cyst does not have typical features or its appearance changes, establishing exactly what it is may become a priority.

4. Very Large or Complicated Cysts

The source identifies very large cysts causing symptoms or risk, as well as situations such as rupture, torsion or infection, as circumstances that may require different management. 12 - Chocolate Cyst (Endometrio…

What is not, by itself, a reason to remove an endometrioma is simply:

“It is there.”

The Question You Should Ask Before Surgery

Before agreeing to an operation, ask your specialist:

“What is this surgery expected to achieve, and what will it cost me in ovarian reserve?”

A clear recommendation should identify the specific purpose of surgery, such as:

• Controlling severe pain
• Improving access to follicles
• Addressing diagnostic uncertainty
• Managing a significant complication

The potential impact on ovarian reserve should also be discussed. 12 - Chocolate Cyst (Endometrio…

What If You Have Already Had Endometrioma Surgery?

Repeat surgery deserves particular caution.

Endometriomas can recur, but ovarian reserve lost during the first operation does not simply return. A second operation is performed on an ovary that has already undergone surgery and may already have reduced reserve. 12 - Chocolate Cyst (Endometrio…

If repeat surgery has been suggested, discuss:

• Current AMH
• Antral follicle count
• Your age
• Whether IVF should be considered first
• Whether egg or embryo freezing should be considered

For a detailed discussion of IVF planning, see What Couples Must Know Before IVF.

What If Both Ovaries Have Endometriomas?

Bilateral endometriomas require additional consideration because both ovaries may be affected.

For a younger woman who has endometriomas on both ovaries but is not ready to conceive, fertility preservation may be worth discussing before surgery.

Depending on the individual situation, this could include egg or embryo freezing. 12 - Chocolate Cyst (Endometrio…

The goal is to consider fertility preservation before ovarian reserve may be affected by another operation.

Can You Have IVF Without Removing the Endometrioma?

In many cases, yes.

IVF can proceed with an endometrioma still present. The ovaries can be stimulated around the cyst, with egg collection planned carefully to avoid puncturing it. 12 - Chocolate Cyst (Endometrio…

Your fertility specialist may consider:

• Expected egg yield
• Accessibility of follicles
• Current ovarian reserve
• Size and location of the cyst
• Pain
• Whether embryo accumulation across more than one cycle may be appropriate

If you are considering multiple IVF cycles, read How Many IVF Cycles Does It Really Take?.

What About Draining the Chocolate Cyst?

Simple drainage alone has a high recurrence rate and is generally not recommended as a standalone treatment.

However, if surgery is genuinely necessary, the surgical technique used can matter. The source notes evidence comparing approaches such as drainage with haemostatic sealants and cystectomy using suturing rather than heat for bleeding control, with differences in their effects on AMH. 12 - Chocolate Cyst (Endometrio…

If surgery is being considered, ask your surgeon:

“How will bleeding be controlled, and how could that affect my ovarian reserve?”

Can a Chocolate Cyst Come Back?

Yes. Endometriomas can recur.

Hormonal suppression may reduce recurrence, but hormonal treatment is contraceptive. This creates an important consideration for women who are actively trying to conceive. 12 - Chocolate Cyst (Endometrio…

This is another reason why repeated ovarian surgery should be carefully considered.

Frequently Asked Questions

Is a Chocolate Cyst Cancer?

A chocolate cyst is a collection of old blood associated with endometriosis, not simply a cancerous tumour. However, your doctor should evaluate unusual or atypical cyst features, particularly when the clinical situation is different from a typical endometrioma. 12 - Chocolate Cyst (Endometrio…

Can I Get Pregnant With a Chocolate Cyst?

Yes, pregnancy can still be possible.

Many women with endometriomas conceive naturally or with fertility treatment. The wider effects of endometriosis, including inflammation, adhesions and tubal function, can be important when assessing fertility. 12 - Chocolate Cyst (Endometrio…

Should I Remove a Chocolate Cyst Before IVF?

Not routinely.

Current guidance does not support routine removal simply to improve IVF outcomes. Surgery may still be appropriate when there is severe pain, difficulty accessing follicles or another specific reason. 12 - Chocolate Cyst (Endometrio…

Does Removing an Endometrioma Improve IVF Success?

The source states that current evidence does not show a live-birth benefit from routine removal before assisted reproduction. 12 - Chocolate Cyst (Endometrio…

Can Medication Treat a Chocolate Cyst?

Hormonal treatment can suppress endometriosis activity and help control pain, but these medications are contraceptive and therefore are not an option while actively trying to conceive. 12 - Chocolate Cyst (Endometrio…

What If My AMH Is Already Low?

If you have both a low AMH and an endometrioma, ovarian reserve becomes particularly important in treatment planning.

The source recommends formally assessing ovarian reserve before an operation is scheduled and considering fertility treatment or preservation where appropriate. 12 - Chocolate Cyst (Endometrio…

Will an Endometrioma Come Back After Surgery?

Recurrence is common, which is one reason repeat surgery should be considered carefully. 12 - Chocolate Cyst (Endometrio…

Does Having a Chocolate Cyst Mean I Have Endometriosis Elsewhere?

Often, yes. Endometriomas may occur alongside other forms of endometriosis, so a broader assessment may be appropriate. 12 - Chocolate Cyst (Endometrio…

The Bottom Line

If you have an endometrioma and are planning pregnancy or IVF, do not assume that the cyst must automatically be removed.

The important questions are:

• Is the cyst causing significant pain?
• Is it obstructing access to follicles?
• Is there diagnostic uncertainty?
• What is your current AMH and ovarian reserve?
• Have you already had ovarian surgery?
• Are you considering IVF now or in the future?
• Would fertility preservation be appropriate?

The current guidance cited in the source recommends against routine endometrioma removal before IVF because it has not been shown to improve live birth and may reduce ovarian reserve. 12 - Chocolate Cyst (Endometrio…

For an individual assessment of an endometrioma and fertility planning, consult Dr. Arnab Kundu at Renew Healthcare.

This article is for general educational purposes and does not replace individual medical advice. Please consult a qualified fertility or gynaecology specialist for advice specific to your situation.