Unilateral megalencephaly is a rare malformation of the central nervous sys
tem characterized by an overgrowth of one cerebral hemisphere due to an ano
maly of neuronal cell migration. It shows macroscopic and histological alte
rations of the central nervous tissue.
We report on a case of this malformation detected prenatally with the suppo
rt of 3D ultrasonography. Copyright (C) 1999 John Wiley & Sons, Ltd.