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Schizencephaly



Schizencephaly
Classification & external resources
ICD-10 Q04.6
ICD-9 742.4
OMIM 269160
DiseasesDB 33031
eMedicine radio/622 

Schizencephaly is a type of cephalic disorder.

Additional recommended knowledge

Contents

Presentation

Schizencephaly is a rare developmental disorder characterized by abnormal slits, or clefts, in the cerebral hemispheres. Schizencephaly can be distinguished from porencephaly by the fact that in schizencephaly the cyst is lined by heterotopic grey matter while a porencephalic cyst is lined 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 (clefts in one hemisphere) may be weak on one side of the body and may have average or near-average intelligence. Patients with schizencephaly may also have varying degrees of microcephaly, mental retardation, hemiparesis (weakness or paralysis affecting one side of the body), or quadriparesis (weakness or paralysis affecting all four extremities), and may have reduced muscle tone (hypotonia). Most patients have seizures and some may have hydrocephalus.

Causes

In schizencephaly, the neurons border the edge of the cleft, implying a very early disruption in development. There was once thought to be a genetic association with the EMX2 gene, although this theory has recently been disproved[1]. Causes of this type may include environmental exposures during pregnancy such as medication taken by the mother, sickness during pregnancy, exposure to toxins, or a vascular insult. Often there are associated heterotopias (isolated islands of neurons) which indicate a failure of migration of the neurons to their final position in the brain.

Treatment

Treatment for individuals with schizencephaly generally consists of physical 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.

 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Schizencephaly". A list of authors is available in Wikipedia.
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