Which perinatal factors are associated with extrapyramidal cerebral palsy?

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Extrapyramidal cerebral palsy reflects injury to the basal ganglia and related motor circuits, which are particularly sensitive to prenatal influences on brain development. A prenatal vitamin deficiency represents a nutritional insult during the fetal period that can disrupt normal development of these motor pathways, increasing the risk for an extrapyramidal (dystonia/choreoathetosis) presentation. Among the options, this is the only factor that is prenatal and directly tied to developmental nutrition, whereas other factors listed (like anoxia, postnatal events, or neonatal infections) are more commonly associated with different CP patterns or with injuries occurring after birth. Prenatal vitamin deficiency thus best fits as a prenatal factor linked to extrapyramidal CP.