SUMMARY -We studied clinical and EEG features of 36 cases with congenital malformations of the CNS. Patients were followed at the outpatient clinic of Hospital Cayetano Heredia and of Hogar Clinica San Juan de Dios in Lima-Peru, from January 1984 to June 1992. Eighty percent of the patients had convulsive syndromes and mental retardation. The most frequent malformation was agenesis of corpus callosum, and it was not possible to find a "typical" EEG pattern. The second were porencephalic cysts, with a good clinical-EEG correlation. There were two typical cases of schizencephaly, one of hemimegalencephaly with good prognosis, and one of holoprosencephaly. The results are compared to those obtained for a series we previously reported. Data discussed take into account reports on the subject registered in the literature. It is concluded that EEG is an useful method to evaluate possible CNS malformations in developing countries.KEY WORDS: central nervous system, congenital malformations, corpus callosum agnesis, porencephaly, hemimegalencephaly, hydrocephaly, EEG. Electroencefalografia e n las malformaciones congénitas del sistema nervioso centralRESUMEN -Estudiamos aspectos clínicos e del EEG de 36 casos de malformaciones congénitas del sistema nervioso central. Los pacientes fueron seguidos en los consultorios externos del Hospital Cayetano Heredia y del Hogar Clínica San Juan de Dios en Lima-Peru, desde enero 1984 hasta junio 1992. Ochenta por ciento de los pacientes presentaron sindrome convulsivo y retardo mental. La anormalidad mas frecuente correspondió a agenesia de cuerpo calloso y no fue posible identificar un patron EEG "típico". El segundo lugar correspondió a quistes porencefálicos, con buena correlación clínico-EEG. Ademas, hubieron dos casos clínicamente típicos de esquizencefalia, una hemimegalencefalia con buen prognóstico y un caso de holoprosencefalia. Se comparan los resultados con aquellos de casos previamente revisados. Se discuten los dados frente a la literatura acerca de los patrones EEG mas frecuentemente relatados. Se concluye en la utilidad del EEG en países en desarrollo para hacer posible un alto grado de sospecha de una malformación del SNC aun en ausencia de CAT-scan. PALABRAS-CLAVE: sistema nervioso central, malformaciones, agenesia de cuerpo calloso, porencefalia, hemimegalencefalia, holoprosencefalia, EEG.The congenital anormalies of the central nervous system (CNS) represent a frequent cause of fetal an d perinatal death . Together with congenital error s of th e metabolism, chromosomopathie s and vascular abnormalities, they play a major role in the pathology of the cerebral lesions responsible for mental retardatio n and/or cerebral paralysis, associate d o r not with convulsive syndromes 17 * 30 .
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