[Cerebral nodular and laminar heterotopic tissue. 2 case reports and review of the literature].

Cerebral heterotopia indicating disturbance of neuronal migration is very rare. There are two kinds of cerebral heterotopia, the laminar and the nodular. The localisation may be diffuse or focal. Not infrequently isolated cerebral heterotopias have no clinical relevance. Typical symptoms on the other hand are psychomotoric retardation and epilepsy.