Zakherah, M., Mohamed, A., Rageh, A. M., & Abdel-Aleem, M. A. (2024). Navigating uterine niche 360 degree: a narrative review. Middle East Fertility Society journal, 29(1). https://doi.org/10.1186/s43043-024-00185-7
Zakherah M, Mohamed A, Rageh AM, Abdel-Aleem MA. Navigating uterine niche 360 degree: a narrative review. Middle East Fertil Soc J. 2024;29(1). doi:10.1186/s43043-024-00185-7
Zakherah, Mahmoud, et al. "Navigating uterine niche 360 degree: a narrative review." Middle East Fertility Society journal, vol. 29, no. 1, 2024.
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Cesarean scar niche repair improves bleeding and pain, review finds
Repairing a cesarean scar niche improves bleeding and pain, a 2024 narrative review of studies in women after cesarean concludes. A niche is a defect in the uterine wall. Most cesarean scar niches cause no symptoms and are often found incidentally. Niche prevalence after cesarean runs from about 2 to 8 out of 10 women, depending on imaging method.
Key Findings
A systematic review cited in the paper reported niche prevalence of 24 to 70% by transvaginal ultrasound and 56 to 84% by sono-hysterography in women with one or more cesareans.
In a prospective study one year after cesarean, 20% of women with a niche had postmenstrual spotting, against 8.3% without, with an odds ratio of 3.34 for larger niches.
A meta-analysis of approximately 33 papers found symptoms improved in 85.00% of women after hysteroscopic resection, 92.77% after laparoscopic repair (including robotic) and 82.52% after vaginal repair.
A systematic review of 13 studies in 234 women with a niche and secondary infertility reported that 65.4% became pregnant after surgery, with a live birth rate of 87.1%.
In a cohort of 642 women with a previous cesarean, rupture or dehiscence occurred in 4% (15 ruptures, 10 dehiscence). The cohort had no ruptures above 4.5 mm residual myometrial thickness.
Interpretation
The paper is a narrative review of published studies on cesarean scar niches. The authors summarize surgical and reproductive outcomes for hysteroscopic, laparoscopic and vaginal niche repair. Most of the surgical studies are prospective or retrospective series. A few are randomized trials. The authors note that trials in one systematic review of infertility outcomes were of moderate to poor quality, with a notable risk of bias. The findings support further study of niche repair for symptom relief and secondary infertility.
RRM Context
Restorative reproductive medicine looks for the underlying cause before treating a symptom. A niche is a scar defect linked to spotting, pain and secondary infertility. For cesarean scar disorder, the review lists other causes to rule out first. These include infection, other uterine disease and missing ovulation. Five of ten hysteroscopy studies in its infertility table call the infertility unexplained in all or most women. Unexplained infertility means undiagnosed.
Our editorial summary of this paper, not the article's abstract.
Abstract
Background
The increasing prevalence of cesarean section (CS) deliveries globally has sparked apprehension regarding potential long-term complications, notably the emergence of uterine niches. CS results in a scar that in certain patients, inadequate healing of that scar results in the development of a uterine niche. While most small niches show no symptoms, large cesarean scar niches in nonpregnant women can give rise to cesarean scar disorder syndrome. This syndrome is characterized by abnormal uterine bleeding, dysmenorrhea, and secondary infertility. In pregnant women, the presence of substantial niches may be linked to potentially life-threatening complications, including cesarean scar dehiscence, uterine rupture, placenta accreta spectrum disorders, placenta previa, and cesarean scar ectopic pregnancy.
Main Body
Given the potential dangers associated with uterine niche occurrence, numerous studies in recent years have delved into the concept of cesarean scar niche, exploring its risk factors, diagnostic approaches, and treatment options. Various diagnostic modalities, such as two- or three-dimensional transvaginal ultrasonography, two- and three-dimensional sono-hysterography, hysterosalpingography, hysteroscopy, or magnetic resonance imaging, can be employed to detect uterine niches. However, none of these diagnostic methods is universally accepted as the “gold standard,” and there remains a lack of unequivocal guidelines on certain aspects related to the diagnosis of cesarean scar niche. These niches, characterized by hypoechoic regions within the myometrium at the site of a previous CS scar, pose diagnostic complexities and provoke inquiries into their prevalence, factors influencing their development, clinical presentations, and appropriate therapeutic approaches.
Conclusion
As CS rates rise, this review aims to understand and address uterine niches and mitigate their impact on maternal health and reproductive outcomes.
A uterine isthmocele is a pouch-like defect at the cesarean scar that causes postmenstrual spotting, pelvic pain, and secondary infertility. Diagnosis, repair options, and the restorative approach.
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