Ovarian torsion is rarely fatal, but it is a surgical emergency that can become life-threatening if untreated. The danger comes from what happens after the ovary twists: blood supply gets cut off, tissue dies, and in severe cases, infection spreads into the abdomen. Most people who reach surgery in time recover fully, but delays of even several hours can mean the difference between saving the ovary and losing it.
How Torsion Becomes Dangerous
When an ovary twists on its supporting ligaments, it first compresses the veins draining blood away from the organ. As the twist tightens, arterial blood flow stops too. The ovary becomes congested, swollen, and starved of oxygen. Without intervention, this progresses to infarction (tissue death) and hemorrhagic necrosis, where the organ essentially begins to break down internally.
The life-threatening scenario occurs when necrotic tissue triggers a severe inflammatory reaction in the abdomen called peritonitis. If bacteria enter the picture, peritonitis can escalate to sepsis and septic shock, both of which can be fatal. This chain of events is uncommon because most cases are caught before reaching that stage, but it represents the real worst-case risk of untreated torsion.
The Time Window for Saving the Ovary
Research shows that the frequency of tissue necrosis increases significantly after about 10 hours of symptoms. Within that 10-hour window, surgeons can typically untwist the ovary and preserve it. After 20 hours, removal of the ovary and surrounding tissue is often necessary because too much damage has occurred. Ovarian function may decline rapidly after 72 hours, though the ovaries have some resilience thanks to their dual blood supply from two different arteries.
These timelines aren’t rigid cutoffs. Some ovaries survive longer twists, and some sustain damage faster. But the pattern is clear: earlier surgery means better outcomes. The challenge is that torsion is notoriously difficult to diagnose quickly.
Why Diagnosis Takes Longer Than It Should
Ovarian torsion mimics several other conditions. The sudden, severe pelvic pain it causes overlaps with appendicitis, kidney stones, ectopic pregnancy, and pelvic inflammatory disease. There’s no single blood test that confirms it, and imaging isn’t as reliable as most people assume.
Ultrasound with color Doppler, the primary imaging tool, has significant limitations. A meta-analysis of ultrasound signs found that checking for reduced blood flow on Doppler had a sensitivity of only 53%, meaning it misses nearly half of torsion cases. The most telling ultrasound finding, called the whirlpool sign (a visual swirling pattern of the twisted tissue), was 65% sensitive and 91% specific. Ovarian swelling was detected 58% of the time. No single ultrasound finding is reliable enough on its own, which is why diagnosis often depends on the overall clinical picture: sudden onset of pain, nausea, a known ovarian cyst, and imaging findings taken together.
This diagnostic uncertainty is part of what makes torsion dangerous. Patients sometimes get sent home with a misdiagnosis, losing valuable hours.
Who Is Most at Risk
The single biggest risk factor is having an ovarian mass 5 centimeters or larger. More than 80% of torsion patients have a mass at least that size. The mass acts like a weight that makes the ovary more likely to flip on its axis. Torsion has been reported with masses ranging from 1 to 30 centimeters, with an average of about 9.5 centimeters, but masses over 5 centimeters are the clearest red flag. These are almost always benign growths like dermoid cysts or large functional cysts, not cancer.
Pregnancy also increases risk, particularly during the first trimester and between weeks 10 and 17, when hormone-stimulated cysts are most common. Torsion during pregnancy occurs in roughly 1 to 5 out of every 10,000 pregnancies and poses risks to both the mother and the fetus, including miscarriage and abdominal infection. Pregnant women with ovarian masses 4 centimeters or larger are at elevated risk.
Torsion is most common in women of reproductive age, but it can happen at any age, including in children and adolescents.
What Surgery Looks Like
The standard treatment is laparoscopic surgery, where a surgeon untwists the ovary (called detorsion) through small incisions. In a large study of surgical outcomes, 91% of women underwent detorsion and kept their ovary, while about 9% needed the ovary removed because the tissue was no longer viable.
The good news for fertility is encouraging. Women who had their ovary removed showed no significant difference in live birth rates compared to those who had detorsion. In the same study, 59% of women who lost an ovary went on to have a live birth, compared to 78% of those who kept theirs. The difference wasn’t statistically significant, largely because the remaining ovary compensates. Rates of needing fertility treatment were nearly identical between both groups, at around 4 to 6%.
Recurrence After Treatment
Torsion can happen more than once, especially if the underlying cause (like a tendency to develop large cysts or naturally long ovarian ligaments) persists. Across all surgical fixation techniques, the overall recurrence rate is about 18%. A preventive procedure called oophoropexy, where the ovary is surgically anchored to reduce its ability to twist, can lower this risk. One technique that fixes the ovary to a nearby ligament showed zero recurrences in a comparative study, though the sample sizes were small and the results didn’t reach full statistical significance.
If you’ve had torsion before, discussing fixation options with your surgeon during the initial procedure is worth doing, since it can potentially be performed at the same time as the detorsion.