Arnold-Chiari malformation classification
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Fahimeh Shojaei, M.D.
Overview
Arnold chiari malformation may be classified according to herniation content into 4 subtypes. Type 1 has herniation of cerebellar tonsils. Type 2 has herniation of cerebellar tonsils and vermis. Type 3 has herniation of cerebellar tonsil and vermis and lower brain stem. Type 4 has cerebellar hypoplasia with brain stem in posterior fossa.
Classification
Arnold chiari malformation may be classified according to herniation content into 4 subtypes:[1]
| Subtypes | Explanation | Association |
|---|---|---|
| Type1 | Herniation parts: Cerebellar tonsils
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Syringomyelia |
| Type 2 | Herniation parts: Cerebellar tonsils and vermis
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Lumbosacral myelomeningocele |
| Type 3 | Herniation parts: Cerebellar tonsil and vermis, lower brain stem
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Occipital encephalocele |
| Type 4 | Herniation parts: Brain stem located in posterior fossa, underdeveloped cerebellum
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A variation of cerebellar hypoplasia |
References
- ↑ Cotes C, Bonfante E, Lazor J, Jadhav S, Caldas M, Swischuk L, Riascos R (June 2015). "Congenital basis of posterior fossa anomalies". Neuroradiol J. 28 (3): 238–53. doi:10.1177/1971400915576665. PMC 4757284. PMID 26246090.