Neonatal brain: sonography of congenital abnormalities.

Sonograms of the brain were obtained in six neonates with congenital intracranial abnormalities. Two of the six abnormalities were echogenic: a lipoma of the corpus callosum and calcific foci associated with toxoplasmosis. Four were anechoic (fluid) lesions including dilated ventricles in two patients, an aneurysm of the vein of Galen, and a Dandy-Walker cyst of the posterior fossa. In all but one patient (the patient with a lipoma of the corpus callosum), the ventricles were enlarged. Sonography has accurately detected and delineated the extent of the congenital intracranial abnormalities and its has been useful in monitoring the ventriculomegaly associated with these lesions.