Chiari I
Low tonsils.
Small fourth ventricle.
Hydromyelia.
Klippel feil.
Occipitalization of the atlas.
Chiari II
Myelomeningocele.
Low tentorium.
Medullary kink.
Hydrocephalus.
Beaked tectum.
Corpus callosum agenesis.
Polymicrogyria.
Syringomyelia.
Lacunar skull.
Chiari III
Cervical occipital encephalocele that contains cerebellum.
Chiari IV
Severe cerebellar hypoplasia.
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