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2. Nuchal cord - Wikipedia

   en.wikipedia.org/wiki/Nuchal_cord

   Of the 237 cases where there was no cord at delivery, ultrasound had false positive results, i.e. diagnosed a cord in 44 of the 237 cases (19%) in which there was no cord present at all. In this study, ultrasound was only 35% accurate at finding a single loop, and only 60% accurate at detecting a nuchal cord wrapped multiple times around the neck.

3. Vasa praevia - Wikipedia

   en.wikipedia.org/wiki/Vasa_praevia

   Vasa previa is diagnosed with ultrasound when echolucent linear or tubular structures are found overlying the cervix or in close proximity to it. Transvaginal ultrasound is the preferred modality. Color, power and pulsed wave Doppler should be used to confirm that the structures are fetal vessels.

4. Doppler ultrasonography - Wikipedia

   en.wikipedia.org/wiki/Doppler_ultrasonography

   Absence of the portal system in a first trimester case associated with hygroma and aorto-umbilical fistula. (A): Transverse plane of the upper abdomen with color Doppler applied, showing umbilical cord insertion, stomach, the prominent hepatic artery and no afferent liver venous perfusion; (B): midsagittal plane reconstructed from a three-dimensional volume acquisition were the crown-rump ...

5. Scrotal ultrasound - Wikipedia

   en.wikipedia.org/wiki/Scrotal_ultrasound

   The ultrasound findings of intravaginal torsion vary with the duration and the degree of rotation of the spermatic cord. Gray scale ultrasound may appear normal if the torsion just occurs. At 4–6 hours after onset of torsion, enlarged testis with decreased echogenicity is seen.

6. Nuchal scan - Wikipedia

   en.wikipedia.org/wiki/Nuchal_scan

   In another study values of 79.6% and 2.7% for the combined screening were then improved with the addition of second trimester ultrasound scanning to 89.7% and 4.2% respectively. [13] A further study reported detection of 88% for trisomy 21 (Down syndrome) and 75% for trisomy 18 ( Edwards syndrome ), with a 3.3% false-positive rate. [ 14 ]

7. Velamentous cord insertion - Wikipedia

   en.wikipedia.org/wiki/Velamentous_cord_insertion

   Abdominal ultrasound can be used to visualize the insertion site of the umbilical cord. [ 3 ] [ 4 ] Overall, visualization is most successful in the second trimester, [ 13 ] however routine ultrasound examination in the second trimester may not detect velamentous cord insertion if the condition develops after the remodelling of the placenta as ...