IMR Press / CEOG / Volume 44 / Issue 6 / DOI: 10.12891/ceog3678.2017

Clinical and Experimental Obstetrics & Gynecology (CEOG) is published by IMR Press from Volume 46 Issue 1 (2019). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on as a courtesy and upon agreement with S.O.G.

Open Access Case Report
Severe tortuous intra-abdominal segment of isolated single umbilical artery by three-dimensional high-definition flow imaging
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1 Department of Ultrasound, Beijing Anzhen Hospital, Capital Medical University; Beijing Key Laboratory of Maternal-Fetus Medicine in Fetal Heart Disease, Beijing, People's Republic of China
2 Department of Surgery, Hospital of the University of Pennsylvania, Philadelphia, PA, USA
3 Department of Obstetrics and Gynecology, College of Medicine, Catholic University, Seoul, Korea
Clin. Exp. Obstet. Gynecol. 2017, 44(6), 956–957;
Published: 10 December 2017

The authors report a tortuous intra-abdominal segment of isolated single umbilical artery (SUA) that proved to be an omega-shaped variant by three-dimensional high-definition-flow (3D-HD-flow) imaging. A 28-year-old woman was referred to the present center for detailed fetal echocardiography examination after finding SUA during routine two-dimensional ultrasound examination at 24+3 weeks’ gestation. 3D-HD-flow demonstrated a severely tortuous and dilated intra-abdominal segment of SUA mimicking omega-shaped variant. Postnatal abdominal ultrasound and cardiac examination were unremarkable. This case suggests that the omega-shaped variant of SUA is probably a normal variant when unassociated with other structural anomalies. When a locally dilated umbilical artery is detected during routine 2D ultrasound, the authors recommend using 3D color Doppler imaging to more precisely determine the course of the umbilical artery.
Single umbilical artery
Three-dimensional imaging
High-definition flow
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