Anatomical progression of the Chiari II malformation

John R. Ruge*, Jeff Masciopinto, Bruce B. Storrs, David G McLone

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


To evaluate whether anatomic change of the relationship of the Chiari II malformation and the cranial base was occurring, 22 children with meningomyelocele had serial MRI scans reviewed. A ratio (B/A) was established between the distance from the foramen magnum to the caudalmost portion of herniated cerebellum (B) and the diameter of the foramen magnum (A) and this ratio was compared on serial MRI scans. Eighteen children had an increase in the B/A ratio, two children had a decrease, and two had no change. This indicates that continuous anatomic change of the Chiari II malformation and the skull base is occurring. Clinical deterioration in the older child may be explained by a combination of compressive and traction forces due to this change.

Original languageEnglish (US)
Pages (from-to)86-91
Number of pages6
JournalChild's Nervous System
Issue number2
StatePublished - Mar 1 1992


  • Chiari II
  • Hindbrain dysfunction
  • Magnetic resonance imaging
  • Meningomyelocele
  • Posterior fossa
  • Skull base

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Clinical Neurology


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