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In page Athetosis:

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Athetosis is a symptom primarily caused by the marbling, or degeneration of the basal ganglia.[citation needed] This degeneration is most commonly caused by complications at birth or by Huntington's disease, in addition to rare cases in which the damage may also arise later in life due to stroke or trauma.[citation needed] The two complications of particular interest are intranatal asphyxia and neonatal jaundice.