Because of the great variation in reports on use of lateral ventricular width/hemispheric width
ratio (LVW/HW or LVR) for diagnosing fetal ventriculomegaly, we attempted to devise an easier
and more reliable way to measure lateral ventricular atrial width (LVAW) directly. Three hundred
sixty-eight fetuses ranging from 15 to 38 weeks of gestation were included in this study. Lateral
ventricular width increased slightly as pregnancy advanced. Antenatal diagnosis of ventriculomegaly based on this method was observed in 9 cases that were confirmed postnatally. Lateral ventricular
width/hemispheric width (LVW/HW) failed to identify 4 cases. Direct measurement of the lateral
ventricular atrium thus appeared to be a more effective method for diagnosing this disorder.