Arnold-Chiari malformation

noun
Ar·​nold-Chi·​ari malformation | \ ˈär-nᵊld-kē-ˈär-ē- How to pronounce Arnold-Chiari malformation (audio) \

Medical Definition of Arnold-Chiari malformation

: a congenital abnormality in which the lower surface of the cerebellum and the lower brain stem protrude into the spinal canal through the foramen magnum She was born with Arnold-Chiari malformation, a rare and random birth defect that occurs, according to one study, in about 8 of 100,000 people. A deformity of the base of the skull and spine, it can cause chronic pain and loss of balance.— Arthur Allen, The Washington Post, 23 Feb. 1997

Note: Arnold-Chiari malformation often occurs with spina bifida and hydrocephalus. It is classified as a type of Chiari malformation.

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Cite this Entry

“Arnold-Chiari malformation.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Arnold-Chiari%20malformation. Accessed 19 Sep. 2021.

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