Fig 2.

Sagittal balanced steady-state free precession sequence from fetal MR imaging (A) of a 33-week fetus and a postnatal sagittal T1-weighted sequence (B) of the same patient demonstrating stenosis of the inferior cerebral aqueduct with associated aqueductal funneling (arrow). As a result, there is marked enlarged of the lateral and third ventricles with dilation of the inferior third ventricular recesses (white arrowheads) depicted by bowing of the lamina terminalis and inferior third ventricular floor. The corpus callosum is thin and superiorly bowed (black arrowheads). Note also the normal size of the fourth ventricle.