Which of the following is not a neuronal migration disorder

Neuronal migration disorders Lissencephaly ⇒ Image 1 It has reduction in the number of gyri Schizencephaly ⇒ Image 2 Unilateral or bilateral clefts in brain  Porencephaly ⇒ Image 3 Presence of cysts within brain. Anencephaly is not a neuronal migration disorder.