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. 1992 Mar;8(2):86-91.
doi: 10.1007/BF00298447.

Anatomical progression of the Chiari II malformation

J R Ruge  1 , J Masciopinto, B B Storrs, D G McLone
Affiliations

Anatomical progression of the Chiari II malformation

J R Ruge et al. Childs Nerv Syst. 1992 Mar.

Abstract

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.

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