Sonography of the umbilical cord.

Dudiak, Christine M.; Salomon, Caryl G.; Posniak, Harold V.; Olson, Mary; Flisak, Michael E.

doi:10.1148/radiographics.15.5.7501849

Cited by 41 publications

(15 citation statements)

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“…The umbilical cord at 10-14 weeks of gestation is 30-50 mm in length and around 2.5 mm in diameter 3,4 . Spiralling of the cord is established by 9 weeks with 0-40 twists 5 . A nuchal cord might form when the umbilical cord is four-fifths as long as the fetus; this could resolve at any time or persist until term 6 .…”

Section: Discussionmentioning

confidence: 99%

The effect of nuchal cord on nuchal translucency measurement at 10–14 weeks

Schaefer

Laurichesse‐Delmas

Ville

1998

Ultrasound in Obstet & Gyne

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The aim of this study was to determine the incidence of nuchal cord and its possible effect on nuchal translucency thickness at 10-14 weeks' gestation. Out of 316 consecutive pregnancies in which nuchal translucency thickness was measured transabdominally, 26 (8.23%) fetuses were shown to have the umbilical cord around the neck. The umbilical cord can be measured together with the nuchal translucency thickness when it passes around the fetal neck and this adds a mean of 0.8 mm to the actual translucency measurement. After the thickness of the cord was subtracted, the measurements of nuchal translucency thickness did not differ from those in the overall population studied. Of the 22 fetuses available for follow-up, a nuchal cord was found in only one at 20 weeks and in none at delivery. Our findings indicate that the presence of a nuchal cord may bias the results of fetal nuchal translucency measurement and that the use of color Doppler might decrease the false-positive rate in screening for fetal aneuploidy by nuchal translucency measurement at 10-14 weeks' gestation.

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Section: Discussionmentioning

confidence: 99%

The effect of nuchal cord on nuchal translucency measurement at 10–14 weeks

Schaefer

Laurichesse‐Delmas

Ville

1998

Ultrasound in Obstet & Gyne

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“…The umbilical cord begins to appear in the 4th week of embryonic development [1], or between the 5th and the 12th week of gestation [2]. The primitive umbilical ring, precursor of the primitive umbilical cord, comes from the ventral flexion line of the amnio‐ectodermal junction.…”

Section: Introductionmentioning

confidence: 99%

The cross-sectional area of umbilical cord components in normal pregnancy

Togni

Júnior

Vasques

et al. 2007

International Journal of Gynecology & Obstetrics

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“…Modern color Doppler imaging techniques have further helped to resolve the problem of diagnosis of SUA at early menstrual ages. 13 In a study by Duerbeck et al, 14 23% of fetuses with SUA had an abnormal S/D ratio-an incidence nearly 10 times higher than that in control populations 15 -whereas 77% had normal S/D ratios. Only 2 cases revealed an abnormally high Doppler S/D ratio (ie, a value higher than the 95% confidence limit for specific menstrual age).…”

Section: Discussionmentioning

confidence: 94%

Prenatal sonographic diagnosis of single umbilical artery

Chang

Shen

et al. 1997

J. Clin. Ultrasound

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Purpose We evaluated the reliability of prenatal sonography and the usefulness of the umbilical vein and artery diameter ratio, transverse umbilical artery diameter, and systolic‐diastolic ratio in detecting single umbilical artery (SUA). Methods In 24 of 6,970 fetuses, SUA was detected using prenatal sonography and confirmed at birth. These cases were retrospectively reviewed. Results Four fetuses had major malformations, and 1 had a minor anomaly. Thirteen fetuses with SUA underwent chromosomal analysis, and only 2 had abnormal karyotypes. Most of the SUA fetuses had a normal systolic‐diastolic ratio. Conclusions Our retrospective study determined that the prognosis of SUA fetuses is good when there is no concurrent anatomic or chromosomal abnormality. Although some reports claim that the transverse umbilical artery diameter or the ratio between umbilical vein and artery diameters can predict SUA, we found no significant improvement in the recognition of SUA using these parameters. © 1997 John Wiley & Sons, Inc. J Clin Ultrasound 25: 425–430, 1997.

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Sonography of the umbilical cord.

Cited by 41 publications

References 0 publications

The effect of nuchal cord on nuchal translucency measurement at 10–14 weeks

The effect of nuchal cord on nuchal translucency measurement at 10–14 weeks

The cross-sectional area of umbilical cord components in normal pregnancy

Prenatal sonographic diagnosis of single umbilical artery

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