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Open AccessArticle

Horizontal Cervix as a Novel Sign for Predicting Adhesions on the Posterior Extrauterine Wall in Cases of Placenta Previa

1
Department of Obstetrics and Gynecology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
2
Department of Obstetrics and Gynecology, Aizenbashi Hospital, Osaka 556-0005, Japan
3
Department of Health Science, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
4
Department of Obstetrics and Gynecology, Rinku General Medical Center, Osaka 598-0048, Japan
*
Authors to whom correspondence should be addressed.
Authors contributed equally to this work.
J. Clin. Med. 2019, 8(12), 2141; https://doi.org/10.3390/jcm8122141
Received: 29 October 2019 / Revised: 28 November 2019 / Accepted: 2 December 2019 / Published: 4 December 2019
(This article belongs to the Section Obstetrics & Gynecology)
: We aimed to identify a magnetic resonance imaging (MRI) feature that can predict posterior extrauterine adhesion (posterior adhesion) antenatally, in patients with placenta previa. We retrospectively reviewed patients with placenta previa who underwent a preoperative MRI examination of placenta accreta spectrum. We categorized the patients into two groups based on whether the cervix was anterior or posterior to a line perpendicular to the anatomical conjugate on the MRI. We projected the perpendicular line toward a straight line through the broad of the back on T2-weighted sagittal MRI images and measured the angle between this line and the line passing through the cervical canal. We analyzed the correlation of the cervical canal angle with the presence of posterior adhesions. Of the 96 patients analyzed, 71 patients had an anteverted cervix and 25 patients had a retroverted cervix. There were 21 posterior adhesions. The adhesion rate was significantly higher in patients with a retroverted cervix than those with an anteverted cervix (8.5% vs. 60%; p = 0.00). The cervical canal angle was ≤10° in 25 patients; of these 17 had adhesions (sensitivity, 81.0%; specificity, 89.3%; area under the curve, 0.887; 95% confidence interval, 0.792–0.981). This finding, labeled “positive horizontal cervix sign,” may be a promising indicator of posterior adhesions in patients with placenta previa.
Keywords: placenta previa; endometriosis; magnetic resonance imaging placenta previa; endometriosis; magnetic resonance imaging
MDPI and ACS Style

Matsuzaki, S.; Okada, A.; Endo, M.; Nagase, Y.; Nakagawa, S.; Hiramatsu, K.; Kakigano, A.; Mimura, K.; Takiuchi, T.; Tomimatsu, T.; Ueda, Y.; Ogita, K.; Kimura, T. Horizontal Cervix as a Novel Sign for Predicting Adhesions on the Posterior Extrauterine Wall in Cases of Placenta Previa. J. Clin. Med. 2019, 8, 2141.

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