Fig. 51.9.

Unilateral periventricular nodular heterotopia (PNH) (A: arrow) with polymicrogyria in the adjacent cortex; two different patients with bilateral PNH (B, C); a patient with PNH in the right temporal horn of the ventricle (D: arrow) and a large subcortical heterotopia extending to the posterior quadrant of the brain (E, F); three patients with different thickness of subcortical laminar heterotopia (double cortex), from thin and discontinuous bands (G) to continuous bands (H, I); three patients with different degrees of lissencephaly–agyria–pachygyria complex, from pachygyria (J), posterior agyria and anterior pachygyria (K), to diffuse lissencephaly (L).