Ultrasonic Measurement of the Fetal Ventricular System

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Abstract
The ventricular systems of 178 fetal [human] heads, ranging from 13 wk gestation to term, were examined with ultrasonic B scans. The width of the frontal horns and of the 3rd ventricle was measured. The distances between the temporal horns and between the sylvian fissures were also examined. The most important clinical measurement is that of the frontal horns. The combined width of the 2 frontal horns averaged 1.1 cm at 13 wk and grew to an average of 2.4 cm at term. The 99% upper limits of confidence for these measurements were 1.45 cm and 2.78 cm, respectively. The frontal horn to BPD [biparietal diameter] ratio decreased from 0.48 at 13 wk to 0.25 at term. These measurements are considered important for the evaluation of possible ventricular dilatation [hydrocephalus] in utero.

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