ArticleBMC pregnancy and childbirth2026
Effects of adenomyosis and endomyometrial junctional zone on spontaneous preterm labor : a case-control study.
Article in BMC pregnancy and childbirth, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundSpontaneous preterm labor (SPL) is a significant obstetric concern, and recent literature suggests an association with adenomyosis. In this study, we compared adenomyosis and endomyometrial junctional zone (JZ) in women with and without a recent history of SPL.
methodsThis case-control study was conducted between October 2019 and Mar 2021. Exclusion criteria included Iatrogenic preterm labor, a history of hormonal drug use after delivery, a history of Müllerian anomaly, endometriosis, fibroids, uterus surgery, cesarean section, and postpartum hemorrhage requiring uterine procedures. The study population consisted of women with a history of SPL or a history of full-term vaginal delivery within the last six months in the study and control groups, respectively. All participants underwent 2- and 3-dimensional transvaginal sonography six months after delivery to assess the JZ thickness and irregularity, and the presence or absence of adenomyosis.
results92 women were included in this study. No significant differences were found regarding age, body mass index, parity, or prior preterm birth. The mean JZ irregularity was 2.53 ± 1.39 mm in the study group and 1.86 ± 0.72 mm in the control group (P = 0.004). In the overall cohort, increased JZ difference was associated with higher odds of SPL (aOR = 1.74). Stratifying by adenomyosis status showed that the association was stronger and remained significant in women with adenomyosis (aOR = 1.88), whereas it lost significance in those without adenomyosis.
conclusionSPL is notably associated with the JZ characteristics and adenomyosis. Further studies are recommended to explore the relationship between these factors and pregnancy outcomes.
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