'Acquired' Chiari I malformation. Case report

P. P. Huang*, S. Constantini

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Tonsillar descent of the cerebellum in Chiari I malformations is often considered a congenital defect. A patient is presented in whom magnetic resonance (MR) imaging revealed normally positioned cerebellar tonsils; however, 1 year later MR imaging was repeated for evaluation of gait abnormalities and showed descent of the cerebellar tonsils. This case illustrates worsening symptoms with progressive descent of the cerebellar tonsils and suggests that Chiari I malformations can evolve postnatally.

Original languageEnglish
Pages (from-to)1099-1102
Number of pages4
JournalJournal of Neurosurgery
Issue number6
StatePublished - 1994
Externally publishedYes


  • Chiari malformation
  • cerebellum
  • tonsillar herniation


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