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The Chiari malformations are a family of conditions characterized by developmental or, less commonly, acquired displacements of the cerebellum. The original 19th century description by Hans Chiari delineated 4 types, but only types 1 and 2 are more than curiosities. The Chiari malformation type 2 (CM2) is associated with myelomeningocele: insufficient enlargement of the posterior fossa during fetal development fails to accommodate the growth of the cerebellum and the brainstem, squeezing portions of the inferior vermis and the medulla down into the cervical spinal canal.1 The Chiari malformation type 1 (CM1) …
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