1. Introducción y Relevancia de la Neuroimagen
La Resonancia Magnética Cerebral (RM) constituye la prueba complementaria de primera línea tras la anamnesis y la exploración neurológica detallada en todo niño con sospecha de Parálisis Cerebral Infantil (PCI). Se estima que la RM revela anomalías patogénicas en más del 80% de los casos, orientando sobre el momento temporal y la naturaleza de la noxa cerebral.
2. Clasificación SCPE según Patrones de Neuroimagen
La red de Surveillance of Cerebral Palsy in Europe (SCPE) estratifica los hallazgos de neuroimagen en 5 categorías esenciales:
- Lesiones predominantes de la sustancia blanca (aprox. 50%): Leucomalacia periventricular, secundarias típicamente a eventos isquémicos o infecciosos perinatales en prematuros.
- Lesiones de sustancia gris cortical y ganglios basales (aprox. 20%): Lesiones hipóxico-isquémicas a término o encefalopatías perinatales agudas.
- Malformaciones del desarrollo cerebral (aprox. 11%): Trastornos de migración, polimicrogiria, esquicencefalia o lisencefalia.
- Resonancia Magnética Normal (aprox. 11%): Ausencia de daño estructural adquirido evidente.
- Miscelánea / Inespecíficos: Otras alteraciones anatómicas no categorizables en los grupos anteriores.
3. ¿Cuándo Indicar Estudios Genéticos en PCI?
El rendimiento diagnóstico del estudio genético (microarrays cromosómicos, paneles de secuenciación masiva o exoma completo) varía drásticamente según el patrón de neuroimagen:
- Indicación Prioritaria y Alta Sospecha Monogénica: En pacientes con RM normal o con malformaciones del desarrollo cerebral, la probabilidad de una etiología monogénica subyacente es muy elevada. En estos casos, el estudio genético está formalmente indicado.
- Vulnerabilidad Genética en Lesiones Adquiridas: En casos con lesiones de sustancia blanca o gris adquiridas sin antecedentes claros de asfixia o factores de riesgo perinatales, debe considerarse la predisposición genética que aumenta la vulnerabilidad celular ante noxas mínimas.
4. Recomendaciones Prácticas para la Consulta
Ante un paciente con clínica de parálisis cerebral sin antecedentes perinatales claros o con una neuroimagen atípica o normal, se debe evitar asumir una causa lesional no documentada e iniciar de forma precoz el algoritmo genético diagnóstico.
Bibliografía y Referencias
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