The normal, absent, and abnormal corpus callosum: sonographic findings.

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Abstract
The normal corpus callosum can be identified on sonography as a hypoechoic band superior to the 3rd ventricle on the midline sagittal scan and forming the roof of the lateral ventricles on the coronal scan. Absence of the corpus callosum may be partial or complete and may be developmenal or acquired. The sonographic features and associated intracranial abnormalities in 6 patients are presented. The findings include separation of the lateral ventricles with increased angulation and concavity to the medial border due to the prominent bundles of Probst, and dilatation and elevation of the 3rd ventricle with interposition between the lateral ventricles.