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Nuchal Cord
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19 weeks a b b
One loop of umbilical cord around the neck is a normal finding of no significance.
a b b
In the coronal plane, a nuchal cord can be identified as two dark round masses on either side of the fetal neck (arrows).
20 weeks c c  
     
c c  
     
35 weeks c c c
  In this fetus, one and a half loops of umbilical cord are visualized encircling the fetal neck.