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Uptodate Reference Title
Normal first-trimester nuchal translucency
Normal first-trimester nuchal translucency
Nuchal translucency is the lucent zone observed sonographically at the posterior fetal neck. This 11-week fetus has a normal nuchal translucency of 1.2 mm between calipers, as well as a normal nasal bone. The area of nuchal translucency is clearly separate from the underlying amnion (arrows).