Can a chocolate cyst be treated without surgery?

The endometrioma (the "chocolate cyst") is usually operated on. But there's a no-scalpel option. Does it work? A 2026 study puts the numbers down.

By Dr. César Cantú · Laparoscopic Gynecologic Surgeon, Advanced Training in Minimally Invasive Surgery · 4-min read

In short · for you

An endometrioma is an endometriosis cyst on the ovary. Because it holds old, thick blood inside, it's called a "chocolate cyst." The usual approach is surgery, but there's a no-surgery option: drain the cyst and put alcohol inside so it doesn't fill up again — all guided by ultrasound and done through the vagina (no cuts).

The good news: it can almost always be done and is safe in the short term. It also seems to protect the ovary's reserve better than surgery.

The fine print: it comes back in about 1 in 4 within two years. It isn't for everyone, and it doesn't replace an individual evaluation.

The chocolate cyst is one of the most common findings in endometriosis, and one of the most frequent questions in consultation is whether it can be removed without surgery. There is indeed a no-scalpel alternative: it's called ethanol sclerotherapy. The honest question isn't whether it can be done, but how well it works and who it suits. A 2026 study measured exactly that.

The study we reviewed

Recurrence and safety of ethanol sclerotherapy for ovarian endometrioma

B. Aslan et al. · Ankara, Türkiye

91 patients · followed up to 2 years · JMIG 2026

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Published in the Journal of Minimally Invasive Gynecology · 2026

🔎 What kind of study is this? It's a study from a single center with 91 carefully selected patients, looking back at what happened to them. It's useful for getting a sense of things, but it isn't a meta-analysis and it doesn't compare head-to-head against surgery. And since no biopsy was taken, the authors themselves note that cancer safety can't be guaranteed: that's why an individual evaluation stays essential.

What the study found

2026 study · 91 patients

Almost always doable and safe, but it returns in some

What it looked at: whether the procedure could be done, how safe it was, and how often the cyst came back over time.

What it found: it was done almost every time (97 out of 100). Complications were few (fewer than 9 out of 100, none serious). But the cyst came back in about 1 in 4 (22 out of 100 by the first year; 29 out of 100 by two years), a bit more often in patients with higher weight. One point in its favor: the ovary's reserve dropped only slightly.

In plain terms: it's a real option, safe short-term and gentle on the ovary, but with a recurrence rate you need to be clear about.

View the study →

Not every chocolate cyst is operated on the same way, and not all are operated on at all: the best option depends on your case, your age and whether you want to conceive.

What it means in practice

Ethanol sclerotherapy isn't "better" or "worse" than surgery: it's another tool. Its big appeal is that it needs no scalpel and seems to protect the ovary's reserve more, which makes it interesting especially when preserving fertility matters. Its limit is clear: in a share of patients the cyst returns, so it needs follow-up and sometimes a repeat procedure or a move to surgery.

Also, because no biopsy is taken, it doesn't confirm with full certainty what was inside the cyst. That's why it doesn't fit every case, and the decision depends on your age, the size and features of the cyst, your symptoms, and whether you're trying to conceive.

For the patient

If you've been told you have an endometrioma or "chocolate cyst," it's worth knowing that surgery isn't always the only way out. A useful question at your consultation is "is my case for surgery, for a no-scalpel option, or for watchful waiting?". The answer doesn't come from an article: it comes from evaluating your case calmly, with the imaging in hand.

Do you have an endometrioma and want to understand which option suits your case?

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Sources

Aslan B, Kaplan NB, Atabekoğlu C, Sönmezer M, Şükür YE. Risk factors for recurrence and safety outcomes after ethanol sclerotherapy for ovarian endometriomas. J Minim Invasive Gynecol. 2026. doi:10.1016/j.jmig.2026.09.471

Educational content. It does not replace an individual medical evaluation. Treatment of an endometrioma is defined case by case in consultation.