National Library of Medicine - National Institute of Health PubMed Abstract - Extrapyramidal cerebral palsy: a changing view - Earlier surveys of cerebal palsy characterized patients with extrapyramidal (choreoathetoid) cerebral palsy as having little cognitive impairment and few associated deficits. Anoxia, which has now replaced neonatal hyperbilirubinemia as a major cause of this type of cerebral palsy, predictably produces a diffuse type of brain damage.
National Library of Medicine - National Institute of Health - PubMed Abstract - Brain magnetic resonance imagine in suspected extrapyramidal cerebral palsy; observations in distinguishing genetic-metabolic from acquired causes