Look for it with the right scan and you find it in about two thirds of women. That is how common it is, not how bad it is.
A niche is a small dent or pocket in the scar on the uterus where a cesarean was closed. It has a frightening name and an ordinary frequency.
263 women in the Netherlands were scanned six to twelve weeks after a cesarean, using two methods. On a standard vaginal ultrasound, 49.6% had a niche. On the more sensitive method, where fluid is put into the uterus first, 64.5% had one. The authors wrote: A niche is present in 64.5% of women 6-12 weeks after caesarean section, when examined by GIS.
64.5%
Have a niche
On the most sensitive scan, 6 to 12 weeks after a cesarean
Read that as a statement about looking, not about damage. If you scan two thirds of women and find something in two thirds of them, the finding is close to normal anatomy after this operation. Women with a niche did report more spotting after their period than women without one, though the study could not pin down how much more.
Here is why this belongs in a section about expectations. A niche is usually found by accident, during a scan done for something else, and it is usually explained to a woman in the language of a defect. Being told there is a hole in your uterus, months after a birth you may already feel bad about, is a specific kind of harm. It is much easier to hear before it happens than after.
What is not knownHow many niches ever cause a symptom. When one is worth treating. Whether repairing one helps. None of those questions has a verified answer that can be published here, and a large and fast-moving surgical literature is arguing about all three right now. If someone offers you an operation for a niche, that uncertainty is part of your consent.
If a scan report mentions a niche"Is this causing any of my symptoms, or was it found by accident?" "What proportion of women who have had a cesarean have one of these?" "What happens if we do nothing?"
Where this comes from:
563. van der Voet LF, Bij de Vaate AM, Veersema S, Brolmann HA, Huirne JA. Long-term complications of caesarean section. The niche in the scar: a prospective cohort study on niche prevalence and its relation to abnormal uterine bleeding. BJOG. 2014;121(2):236-44.
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This page is educational. It supports the conversation with your own clinicians. It is not consent to any treatment, and it cannot assess you. If you are worried about a symptom now, see urgent warning signs.
