A new autosomal recessive syndrome of pachygyria.

Pachygyria is a rare development disorder resulting from impaired neuronal migration. Usually, it is a sporadic phenomenon, but rare dominant or autosomal recessive syndromes are known. This report describes a family in which the parents are first cousins and three of the siblings suffer from moderate mental retardation, pachygyria and strabismus. It is suggested that this is a distinct type of autosomal recessive pachygyria.