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

Fetal profile

visible nasal bone measurement of the nuchal lucency

Transverse section of the abdomen  

abdominal wall closed  normal size of the stomach

Longitudinal section of the fetus

diaphragm stomach seen below the diaphragm

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

Fetal legs

check for existence of both legs all long bones and both feet seen

Fetal hands

both hands seen all long bones and fingers seen

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"