2002-02-11-14 Ultrasound examination in the first trimester © Novakov www.thefetus.net/
Ultrasound examination in the first trimester
Aleksandra Mikic Novakov, MD
Novi Sad, Yugoslavia
Normal fetal morphology
 | - complete ossification of the skull
- choroid plexuses fill the skull
- "butterfly shape" of the choroid plexuses
- uninterrupted midline echo
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Fetal profile
 | -
visible nasal bone - measurement of the nuchal lucency
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Transverse section of the abdomen
 | - abdominal wall closed
- normal size of the stomach
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Longitudinal section of the fetus
 | - diaphragm
- stomach seen below the diaphragm
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Transverse section of the abdomen at the level of the cord insertion
 | - anterior abdominal wall closed
- normal insertion of the umbilical cord
|
Fetal bladder
 | - bladder seen, normal size
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Fetal legs
 | - check for existence of both legs
- all long bones and both feet seen
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Fetal hands
 | - both hands seen
- all long bones and fingers seen
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Measurement of nuchal translucency (Snijders RJM et al)
 | - gestational age 11 - 14 weeks (CRL 45-84 mm) (Snijders RJM, Nicolaides KHN)
- maximal enlargement of the image (fetus occupies 75% of the whole image)
- longitudinal section of the fetus (profile clearly seen)
- fetus away from the amnion (three parallel lines seen)
- the biggest thickness behind the neck is measured
- calipers put on the tissue following the rule "on/on"
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