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Fetal lateral ventricular ratio determination during the second trimester.

D H Pretorius, J A Drose, M L Manco-Johnson

Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine

|March 1, 1986

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The lateral ventricular ratio (LVR) helps diagnose fetal ventriculomegaly. This study validates normal LVR ranges in the second trimester, aiding accurate ultrasound diagnosis of abnormal ventricular size.

Area of Science:

Medical Imaging
Fetal Medicine
Neurology

Background:

Ventriculomegaly diagnosis relies on identifying abnormal ventricular size via ultrasound.
The lateral ventricular ratio (LVR) is a key index for differentiating normal from enlarged ventricles.
Accurate LVR ranges are crucial, especially before 24 weeks gestation when diagnosis can be challenging.

Purpose of the Study:

To validate previously reported data on the normal range of the lateral ventricular ratio (LVR) during the second trimester of pregnancy.
To establish reliable sonographic reference values for fetal ventricular size.
To improve the diagnostic accuracy of ventriculomegaly in early fetal development.

Main Methods:

Calculation of LVRs from 122 normal fetal ultrasound examinations.

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Measurements were taken by three independent observers.

Data collected weekly from 15 to 25 weeks of gestation.

Main Results:

Lateral ventricular ratios (LVR) ranged from 56 +/- 18% at 15 weeks to 33 +/- 4% at 25 weeks.
Normal lateral ventricular width (LVW) was 0.7-1.1 cm.
Hydrocephalic fetuses showed LVW ranging from 1.1-2.7 cm.

Conclusions:

The LVR is highly effective in distinguishing ventriculomegaly from normal ventricular size.
Serial ultrasound examinations in the second trimester are often necessary for definitive diagnosis.
A lateral ventricular width (LVW) under 1.1 cm typically indicates normal ventricular size.