Learning Objectives:
  • To recognise fetal anomalies were increased in pregnancies with an increased nuchal translucency and discordant CRL
  • To know that MC pregnancies had a higher incidence of fetal anomalies than DC pregnancies
  • To quantify the frequency of defects detected at the 11-13 week ultrasound in twin pregnancies
  • To identify the type of defects that are routinely detected at the 11-13 week ultrasound and what defects are routinely missed at this ultrasound.  



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1. Is there increased incidence of nuchal tube > 95 or 97% OR discordant CRL in twin pregnancies with anomalies compared to those without at 11-13 weeks? (Required.)

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2. How many pregnancies was a defect detected in? (Required.)

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3. Of those with defects what proportion were diagnosed at 11-13 weeks? (Required.)

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4. What defects were commonly missed at the 11-13 week US in twins? (Required.)

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5. What defects were always diagnosed at the 11-13 week US in twins? (Required.)

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