Cases of Retroverted Uterus Involving Placenta Previa and Low-Lying Placenta Previa Are Significantly Associated with Endometriosis

Eika Harigane, Takashi Matsushima, Asako Watanabe, Hiroki Shinmura, Ryuhei Kurashina, Daisuke Shigemi, Shunji Suzuki
Journal of Nippon Medical School = Nippon Ika Daigaku zasshi · 2025 · vol. 92(1) , pp. 22–28 · doi:10.1272/jnms.JNMS.2025_92-106 · PMID:40058832
other OA: gold public-domain-us
🔓 Open OA copy Full text JSON View on PubMed View at publisher
⚙ AI-generated summary by claude@2026-06, 2026-06-08 ⓘ

This study found that placenta previa and low-lying placenta previa in patients with a retroverted uterus are significantly more likely to be associated with endometriosis.

One-sentence paraphrase of the abstract; not a substitute for reading it. No clinical advice. How this works

⚙ AI-generated deep summary by claude@2026-06, 2026-06-08 · read from full text ⓘ

This retrospective case-control study examined whether placenta previa or low-lying placenta previa occurring in patients with a retroverted uterus is significantly associated with endometriosis, using cesarean section patients at a single hospital (2015–2022). Researchers compared the presence of retroverted uterus in early pregnancy and the presence of posterior placenta across groups with versus without endometriosis, with endometriosis determined by intraoperative findings; exclusions included multiple pregnancies and incomplete uterine imaging before 12 weeks. Among 110 included patients (32 with endometriosis, 78 without), retroverted uterus was more common in the endometriosis group (46.9% vs 21.8%, P=0.01), and retroverted uterus with posterior placenta was also more frequent (46.9% vs 20.5%, P=0.009). This paper is centrally about endometriosis — it assesses the statistical association between endometriosis and placenta previa/low-lying placenta previa in retroverted uterus cases.

Read from the paper's body, not the abstract. Not a substitute for reading the paper. No clinical advice. How this works

Abstract

BACKGROUND: The purpose of this study was to determine whether cases of placenta previa and low-lying placenta previa in patients with retroverted uterus are significantly associated with endometriosis. METHODS: Participants were patients who underwent cesarean section at our hospital with a diagnosis of placenta previa or low-lying placenta previa within a 7-year period from January 2015 to December 2022. Of these, patients with multiple pregnancies and those without a complete uterine image in the medical record at less than 12 weeks' gestation were excluded. Included patients were divided into two groups according to the presence or absence of endometriosis. The presence of endometriosis was determined based on intraoperative findings. A retrospective case-control study was conducted by examining the presence or absence of retroverted uterus during early pregnancy and the presence or absence of posterior placenta. RESULTS: A total of 110 patients were included, 32 in the group with endometriosis and 78 in the group without endometriosis. There were 15 (46.9%) cases of retroverted uterus in the group with endometriosis and 17 (21.8%) in the group without endometriosis, indicating significantly more cases in the group with endometriosis (P=0.01). There were 15 (46.9%) cases of retroverted uterus with posterior placenta in the group with endometriosis and 16 cases (20.5%) in the group without endometriosis, indicating significantly more cases in the group with endometriosis (P=0.009). CONCLUSION: Placenta previa and low-lying placenta previa in cases of retroverted uterus are significantly associated with endometriosis.
Full text 2,078 characters · extracted from oa-doi-fallback · 2 sections · click to expand

Keywords

endometriosis, low-lying placenta previa, placenta previa, posterior extrauterine adhesions, retroverted uterus 2025 Volume 92 Issue 1 Pages 22-28 Details

Abstract

Background: The purpose of this study was to determine whether cases of placenta previa and low-lying placenta previa in patients with retroverted uterus are significantly associated with endometriosis. Methods: Participants were patients who underwent cesarean section at our hospital with a diagnosis of placenta previa or low-lying placenta previa within a 7-year period from January 2015 to December 2022. Of these, patients with multiple pregnancies and those without a complete uterine image in the medical record at less than 12 weeks' gestation were excluded. Included patients were divided into two groups according to the presence or absence of endometriosis. The presence of endometriosis was determined based on intraoperative findings. A retrospective case-control study was conducted by examining the presence or absence of retroverted uterus during early pregnancy and the presence or absence of posterior placenta. Results: A total of 110 patients were included, 32 in the group with endometriosis and 78 in the group without endometriosis. There were 15 (46.9%) cases of retroverted uterus in the group with endometriosis and 17 (21.8%) in the group without endometriosis, indicating significantly more cases in the group with endometriosis (P=0.01). There were 15 (46.9%) cases of retroverted uterus with posterior placenta in the group with endometriosis and 16 cases (20.5%) in the group without endometriosis, indicating significantly more cases in the group with endometriosis (P=0.009). Conclusion: Placenta previa and low-lying placenta previa in cases of retroverted uterus are significantly associated with endometriosis. © 2025 by the Medical Association of Nippon Medical School Favorites & Alerts Recently viewed articles Predecessor

Text is read by the "Ask this paper" AI Q&A widget below. Extraction quality varies by source — PMC NXML preserves structure cleanly, OA-HTML may include some navigation residue, and OA-PDF can have broken hyphenation. The publisher copy (via DOI) is the canonical version.

My notes (saved in your browser only)

⚙ Ask this paper AI returns verbatim quotes from the full text · source: oa-doi-fallback ⓘ

Answers must be backed by verbatim quotes from this paper's full text. Hallucinated quotes are dropped automatically; if no verbatim passage answers the question, we say so. How this works

Condition tags

mesh:D004715endometriosis

MeSH descriptors

Endometriosis Endometriosis Endometriosis Endometriosis Endometriosis Endometriosis Endometriosis Endometriosis Endometriosis Endometriosis Endometriosis Endometriosis Endometriosis Endometriosis Endometriosis Endometriosis Endometriosis Endometriosis Endometriosis Placenta Previa

Citation neighborhood (no data yet)

We don't have any in-corpus citations linked to this paper yet. This is a recent paper (2025) — citers typically take a year or two to land, and the OpenAlex reference graph may still be filling in.

Source provenance

europepmc
last seen: 2026-06-04T01:30:01.192114+00:00
pubmed
last seen: 2026-05-30T00:31:48.458556+00:00
unpaywall
last seen: 2026-05-11T08:34:28.763810+00:00
License: public-domain-us · commercial use OK · attribution required
Courtesy of the U.S. National Library of Medicine