Arnold–Chiari malformation

synonym: Chiari malformation
https://doi.org/10.1351/goldbook.10427

Congenital herniation of the brainstem and lower cerebellum through the foramen magnum into the cervical vertebral canal.

Note: This malformation is often associated with meningocele and spina bifida.
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 726 [Terms] [Paper]