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Updated: Jan 1, 2026

Accurate and Simple Evaluation of Vascular Anastomoses in Monochorionic Placenta using Colored Dye
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Sono-embryological assessments of a true knot that developed into a hypercoiled cord and circumvallate placenta

Junichi Hasegawa1, Natsumi Furuya1, Masatomo Doi2

  • 1Department of Obstetrics and Gynecology, St. Marianna University School of Medicine, Kawasaki, Japan.

The Journal of Maternal-Fetal & Neonatal Medicine : the Official Journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians
|December 31, 2019
PubMed

Longitudinal investigations using ultrasound during pregnancy can be used to clarify the mechanisms and pathophysiology of abnormal fetal and placental development. In this report, we presented a case of a true knot that appeared to develop into a hypercoiled cord and circumvallate placenta, which we found through longitudinal ultrasound investigations during pregnancy. In the present case, ultrasonography proved that the true knot had existed at least 16 weeks of gestation. The true knot was presumed to develop into a hypercoiled cord based on the hypothesis of differential umbilical vascular growth rates.

Keywords:
Circumvallate placentaDopplerfetal growth restrictionhypercoiled cordtrue knotumbilical cord

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