Schizencephaly can be distinguished from porencephaly by the fact that in schizencephaly, the fluid-filled component is entirely lined by heterotopic grey matter, while a porencephalic cyst is lined mostly by white matter. Individuals with clefts in both hemispheres, or bilateral clefts, are often developmentally delayed and have delayed speech and language skills and corticospinal dysfunction. Individuals with smaller, unilateral clefts may be weak or paralyzed on one side of the body and may have average or near-average intelligence. Patients with schizencephaly may also have varying degrees of microcephaly, Cognitive impairment, hemiparesis, or quadriparesis, and may have reduced muscle tone. Most patients have seizures, and some may have hydrocephalus.
In schizencephaly, the neurons border the edge of the cleft, implying a very early disruption of the usual grey matter migration during embryogenesis. The cause of the disruption is not known, but likely the cause may be either genetic or a physical insult, such as infection, infarction, hemorrhage, in utero stroke, exposure to a toxin, or mutation. It is thought that normal neuron migration during the second trimester of intrauterine development, when primitive neuron precursors migrate from just beneath the ventricular ependyma to the peripheral hemispheres where they form the cortical grey matter.
Genetic
There was once thought to be a genetic association with the EMX2 gene, although this theory has recently lost support. However it has been confirmed that mutations in the COL4A1 gene occur in some patients with schizencephaly.
Causes of schizencephaly may also be caused by environmental exposures during pregnancy sickness during pregnancy, exposure to toxins, or a vascular insult. Often there are additional associated heterotopias which indicate a failure of migration of the neurons to their final position in the brain caused by possible stroke.
Treatment for individuals with schizencephaly generally consists of physical therapy, occupational therapy, treatment for seizures, and, in cases that are complicated by hydrocephalus, a shunt.
Prognosis
The prognosis for individuals with schizencephaly varies depending on the size of the clefts and the degree of neurological deficit.
Frequency
In some cases, the defect is linked to mutations of the EMX2, SIX3, and Collagen, type IV, alpha 1 genes. Because having a sibling with schizencephaly has been statistically shown to increase risk of the disorder, it is possible that there is a heritable genetic component to the disease.
