Page 46 - SONO 260 The Fetal Head and Brain

CEREBRAL MALFORMATIONS AGENESIS OF THE CORPUS CALLOSUM AND CAVUM SEPTUM PELLUCIDUM
— The “sunburst” manifestation of the sulci is a straightforward and discernible sonographic finding. In the normal brain, the sulci within the cerebrum typically travel parallel to the corpus callosum, but with agenesis of the corpus callosum they tend to have a more perpendicular or radial arrangement and often appear to have a “spoke wheel” pattern.
— Colpocephaly, small frontal horns and enlarged occipital horns, is often present as well and offers a distinct teardrop shape to the lateral ventricles.
— With absence of the cavum septum pellucidum and corpus callosum, the third ventricle tends to migrate more superiorly and appear dilated.