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
Type1	Herniation parts: Crebellar tonsil, flocculi, caudal medulla
Type 2	Herniation parts: Crebellar tonsil, flocculi, caudal medulla, caudal portion of 4th ventricle
Type 3	Herniation parts: Crebellar tonsil, flocculi, caudal medulla, caudal portion of 4th ventricle, lower brain stem + occipital encephalocele
Type 4	Herniation parts: Brain stem located in posterior fossa, underdeveloped cerebellum

Syringomiyelia associated with Chiari malformation