Chiari malformation type 2 usually occurs sporadically (in people with no family history of the condition). However, the exact cause is not known. Genes may play a role in predisposing a person to the condition, but environmental factors (such as lack of proper vitamins or nutrients in the maternal diet during pregnancy) may also contribute to the condition.
There have been reports in the medical literature of families in which more than one family member had a Chiari malformation. However, limited information specific to familial cases of Chiari malformation type 2 is available.
Last updated: 9/11/2017
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