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ultrasound diagnosis of fatal anomalies

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10 Soft Markers of Chromosomal

Aberrations

Abnormal Shape of the Head

Definition: Brachycephaly: the head ratio (biparietal

diameter/frontal occipital diameter,

BPD/FOD) is above the 95th percentile; for example,

head ratio 0.88, depending on the

method of measurement.

Incidence: As defined above, this applies to

about 5% of all fetuses.

Ultrasound findings: The horizontal cross-section

shows a round shape, with the BPD being

relatively large compared to the FOD.

Fig. 10.1 Strawberry sign, in a case of trisomy

18at19+1weeks.

Fig. 10.2 Brachycephaly. Rounded head at

14 + 1 weeks in trisomy 13.

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