[Type I lissencephaly syndrome. Clinical, neuroradiologic and electrographic analysis].

A case with lissencephaly (agyria) syndrome is described. This brain development defect must be included in the differential diagnosis of all infants with delayed motor development and congenital malformations and convulsions, especially of the infantile spasms kind. It is important to consider chromosomal studies in each of them and to offer genetic counseling to the parents.