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A chocolate cyst of the ovary ( also known as an endometrioma, endometrioid cyst, or endometrial cyst) is found in some infertile women who have endometriosis. In this disease, the inner lining of the uterus ( called the endometrium ) grows in various abnormal locations within the pelvis . One of the commonest sites this aberrant endometrial tissue can be found in is the ovary. With every menstrual period, this tissue grows, enlarges , bleeds, and sloughs off . Here it forms a cyst; and because the contents of this cyst are black, tarry and thick, they resemble dark chocolate , hence the name ! ( I feel that sometimes doctors can have a perverse sense of humor . For most women, the word chocolate produces happy feelings, because chocolates are a woman’s favourite treat. To label a disease condition after a dessert is something which only an unfeeling man would do ! )

How is the diagnosis made ? While an alert doctor will often suspect the diagnosis in infertile women with progressively painful periods, often women with chocolate cysts may have no symptoms at all. This means this diagnosis is made during a regular infertility workup ; or even during a routine pelvic examination. While some cysts are large enough to be felt on pelvic examination, many are small and cannot be detected on clinical examination.

Ultrasound scanning is an excellent way of diagnosing chocolate cysts and can pick up cysts which are very small. On scanning, chocolate cysts are complex masses ( which have both solid and cystic components); and are often tender. They have a typical ground glass appearance because they contain old blood. They can vary in size from a few mm to over 10 cm; and can be bilateral. However, it’s not possible to make a definitive diagnosis of endometriosis on ultrasound scanning, as many other conditions can also produce cysts in the ovary. The diagnosis can be confirmed either by aspirating the cyst under ultrasound guidance ( and finding the typical dark old blood which is diagnostic of endometriosis); or by doing a laparoscopy.

In the past, a laparoscopy was the gold standard for making the diagnosis of endometriosis, as this allowed the doctor to actually inspect the pelvic contents. However, because it involves surgery, many infertility specialists no longer do a laparoscopy for their patients.

There are 3 key factors which doctors need to evaluate when making a decision as to how to treat chocolate cysts in infertile women.

1. Whether the patient has any symptoms
2. The size of the cyst
3. The AMH level

Thus, when a small chocolate cyst is picked up when doing a routine vaginal ultrasound scan in a young asymptomatic infertile woman , the best course of action maybe masterly inactivity. This is because this is an incidental finding which is best documented and left alone. Remember that doctors do not treat ultrasound images - we treat patients ! Many fertile young women also have endometriotic cysts which they live with happily for all their lives ( and because they have enough sense not to go to a doctor, they often do not even know that they have a chocolate cyst !) Unfortunately, many doctors tend to be trigger-happy, and when they find a cyst on a pelvic ultrasound scan, they reflexly perform laparoscopic surgery – both to confirm the diagnosis; and to treat the cyst ! The danger is that this unnecessary surgery can actually reduce your fertility , as normal ovarian tissue is also removed along with the cyst wall, thus reducing your ovarian reserve.


Small cysts ( less than 3 cm in size) can be happily left alone . If they are larger, they can be monitored by serial scans, before making a decision as to what the definitive treatment should be.

As regards treatment choices, the options include medical therapy or surgery. Medical therapy consists of medicines such as danazol or GnRH analogs to suppress the endometriosis; and while this is very effective in providing temporary symptom relief , it is not very effective in treating the cyst, which tends to remain inspite of the treatment.

The definitive solution is surgical; and this usually consists of operative laparoscopy . Very few doctors will now do open surgery ( laparotomy) to treat a cyst, no matter how large it is.
There are many controversies regarding the optimal surgical management of chocolate cyst s in an infertile woman, which is why it is important that you go to an expert. In the past , doctors would try to excise ( completely remove) the entire cyst , to reduce the risk of its recurring . However, because this meant that they needed to also sacrifice normal ovarian tissue during this process, they often ended up pushing infertile patients from the frying pan into the fire by reducing their ovarian reserve and worsening their infertility ! This is why most doctors today prefer to be far more conservative in infertile women with chocolate cysts ; and will usually just create an opening in the cyst wall ( marsupialisation) to drain the contents. This often provides dramatic temporary relief. During the operative laparoscopy, the doctor also has an opportunity to remove the adhesions (scar tissue) and the other endometrial implants which are often found in women with chocolate cysts and treating these can also help to enhance their fertility for a few months. The chances of achieving a pregnancy are maximal within a few months after the surgery. However, if a patient has failed to conceive within one year of the surgery, then the chances of success with repeat surgery are quite poor; and it’s better to consider assisted reproduction.

The major bugbear with chocolate cysts is that they tend to recur. This is why doctors will often combine medical suppression with surgical treatment. However, all these are temporizing measures, which help to buy the patient time – we really do not have any way of curing this enigmatic disease !

If the chocolate cyst recurs, patients are understandably upset, and feel that the doctor was incompetent and did not do a good job with the surgery. This is not always true, because endometriosis can be quite an aggressive disease in some women, and can recur even if the surgeon was very skilled. It’s important to ask for DVD documentation of all surgical intervention, so that the video can be reviewed later on, if needed.

If the cyst recurs, patients will often go to another surgeon ( who they feel is more expert) to try to correct the problem. The pelvis in some of these patients starts resembling a battle field, because they often end up having many laparoscopies done by many different surgeons, each of whom claims to be the best ! The surgery can be extremely challenging in these patients . The scarring , adhesions and previous surgery tend to distort the anatomy and the pelvis sometimes is completely frozen. Operative complications in these cases ( for example, inadvertently opening the bladder or rectum) are not uncommon.

The AMH level is a very important factor which many doctors tend to overlook in treating infertile women with endometriosis. The major danger with endometriosis is that the chocolate cyst replaces normal ovarian tissue, as a result of which many of these patients have little normal ovarian tissue and poor ovarian reserve as a result of their disease. This is why it’s important to assess your ovarian reserve by checking your AMH level and your antral follicle count before doing anything further ! If your AMH level is low, then it’s best to avoid surgery and to move on to IVF to maximize your chances of having a baby quickly ( before the disease becomes worse and eats away more of your precious reserve).

For young women with normal ovarian reserve, open fallopian tubes ( as proven on HSG) and small chocolate cysts who have no symptoms, it’s worth trying IUI before doing anything more aggressive. However , if the patient is symptomatic and the endometriosis is causing pain, then this become a trickier issue ! You need to set your priorities – is pain control more important ? Or is having a baby more important ? This is often a difficult decision to make, but you need to decide. It’s best to make a list of all your options so you can think through these logically.
If having a baby is key, then it’s best to manage your pain symptomatically and concentrate your energies on getting pregnant quickly. IVF is very effective , as it maximizes your chances of getting pregnant quickly . The beauty with IVF is that it allows you to kill 2 birds with one stone – not only do you get your deeply desired baby, you also have dramatic pain relief for at least 1 year ( because your periods will stop during your pregnancy and your postpartum period ). As an added bonus, the endometriosis will also get better as a result of the pregnancy in some women ! This is why many doctors advise that the best treatment for a young woman with endometriosis is a pregnancy. Of course, this is easier said than done, because endometriosis does affect your fertility !

Do you have a chocolate cyst and are unsure what to do ? Send me your medical details by filling in the free second opinion form and I'll be happy to help !

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I saw a patient who wanted a third opinion. She was completely confused. As part of her infertility workup, she had had a HSG ( hysterosalpingogram) done. The X-ray showed that her uterine cavity was normal; the dye filled the fallopian tubes , but the spill into the abdominal cavity was loculated.

When she saw her doctor with the report, he told her that this suggested that there were adhesions around the tubes, and she needed an operative laparoscopy to treat this. Another doctor, to whom she had gone for a second opinion advised her against the laparoscopy. He felt that since the tubes were open, her best option would be to do an IUI, to improves the chances of the eggs and sperm meeting. This patient then sought a third opinion, which is why she came to me !

The first thing I did was to ignore the earlier opinions, and asked to see a copy of the original HSG X-ray films, so I could make up my own mind . Unfortunately, there was only one film, and this was of poor quality . The radiologist had done a sub-optimal study, because he had not taken any delayed films ( perhaps to save some money ?), as a result of which it was hard to draw a firm conclusion based on the HSG films. This meant were now back to square one.

The choices were; repeat the HSG; do a laparoscopy; or assume the tubes were fine and proceed with treatment. Each has advantages and disadvantages, and patients need to think their way carefully through their choices, so they can make the right decision. Unfortunately, most patients are not used to making choices regarding their medical treatment. Even worse, most doctors are not comfortable offering these choices to their patients. "The doctor knows best" is the model most patients ( and doctors) are happy to adopt - which means that often the wrong decision is made ( and usually for the wrong reasons).

We could repeat the HSG in a better clinic and make sure that it was done under fluoroscopic guidance and that delayed films were taken. While this option would give a much better X-ray image of the tubes, she was understandably reluctant to repeat the HSG. This is quite a painful procedure - and few women have the courage to do it again !

Laparoscopy is a surgical procedure, which means it costs more; however, the quality of the documentation is much better, because the surgeon can take videos of the pelvic anatomy. However, it cannot provide information on tubal function - which is really the only thing the patient wants to know - are my tubes working properly or not ?

Doing a laparoscopy was an option - but this is an expensive surgical procedure - and while it provides useful diagnostic information, it often does not change treatment options , which is why we are very reluctant to perform this in our clinic. What's the point of doing a test if it does not impact treatment alternatives ?

So what are patients supposed to do when their doctors disagree ? Some of them get very angry and upset when doctors do not see eye to eye ! I actually feel it's good for patients when doctors disagree. Each doctor will present his point of view and justify why this is better than the alternative proposed by the other doctor . The patient gets to see the pros and cons of both options, so she can make a better-informed decision !