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Fig. 1 | BMC Pregnancy and Childbirth

Fig. 1

From: Utility of fetal facial markers on a second trimester genetic sonogram in screening for Down syndrome in a high-risk Thai population

Fig. 1

Measurement of mid-facial plane facial ultrasound markers. Legend: The landmarks used for measurement of the facial ultrasound markers in the study are shown in (A). PT is the distance between the edge of the lowest part of the frontal bone and the facial skin anteriorly (A), NBL is measured at the ossification line along the fetal nose (B). Also shown are ultrasound images of the mid-facial plane in a euploid fetus (B) and a Down syndrome fetus with a hypoplastic nasal bone (C) and absent nasal bone (D). PT: prenasal thickness; NBL: nasal bone length. 

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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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