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Schizencephaly: clinical spectrum, epilepsy, and pathogenesis
Tiziana Granata1, Elena Freri, Claudio Caccia
1Division of Child Neurology, IRCCS-Istituto Nazionale Neurologico C. Besta, Milan, Italy. granata@istituto-besta.it
Journal of Child Neurology
|June 1, 2005
Summary
Schizencephaly presents with variable motor and cognitive deficits, influenced by cleft size and associated brain malformations. Epilepsy outcomes are not solely tied to malformation severity, suggesting functional reorganization plays a key role.
Area of Science:
- Neuroscience
- Developmental Biology
- Medical Genetics
Background:
- Schizencephaly, a rare brain malformation, is characterized by clefts in the cerebral hemispheres.
- Its clinical presentation, pathogenesis, and genetic underpinnings remain incompletely understood after decades of study.
Purpose of the Study:
- To review recent studies on schizencephaly to delineate its imaging and clinical spectra.
- To discuss controversies regarding its pathogenesis and etiopathogenesis.
- To evaluate the role of genetic factors, including the EMX2 gene.
Main Methods:
- Comprehensive review of recent literature on schizencephaly.
- Analysis of clinical data, imaging findings (including functional MRI), and genetic studies.
Main Results:
- Clinical severity varies widely, correlating with cleft size, location, and associated cerebral malformations.
- Epilepsy affects about half of patients, with drug resistance in a third, independent of malformation severity.
- Functional cortical reorganization may be crucial for clinical outcomes, alongside anatomical damage.
Conclusions:
- The etiopathogenesis of schizencephaly remains largely debated, with the EMX2 gene implicated in only a minority of cases.
- Understanding functional reorganization is key to predicting clinical outcomes.
- Further research is needed to fully elucidate the causes of this complex brain malformation.