Arnold-Chiari malformation classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Classification

Arnold chiari malformation may be classified according to herniation content into 4 subtypes:^[1]

Subtypes	Explanation	Association
Type1	Herniation parts: Cerebellar tonsils	Syringomyelia
Type 2	Herniation parts: Cerebellar tonsil and vermis	Lumbosacral myelomeningocele
Type 3	Herniation parts: Cerebellar tonsil and vermins, lower brain stem	Occipital encephalocele
Type 4	Herniation parts: Brain stem located in posterior fossa, underdeveloped cerebellum	A variation of cerebellar hypoplasia

Syringomiyelia associated with Chiari malformation