A caesarean scar defect, also called an isthmocele or uterine niche, is a pocket or indentation that forms at the site of a previous caesarean section scar on the uterus. It can cause abnormal bleeding between periods and may affect fertility or increase the risk of complications in future pregnancies. An MRI may show changes at the lower uterine wall consistent with a scar defect. Finding a caesarean scar defect early may allow for management or surgical repair before it causes symptoms or complications in a future pregnancy.
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