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  • Title: Chiari I anatomy after ventriculoperitoneal shunting: posterior fossa volumetric evaluation with MRI.
    Author: Osuagwu FC, Lazareff JA, Rahman S, Bash S.
    Journal: Childs Nerv Syst; 2006 Nov; 22(11):1451-6. PubMed ID: 16733759.
    Abstract:
    INTRODUCTION: Cephalocranial disproportion was said to be responsible for Chiari I malformation after ventriculoperitoneal shunt. We aimed to evaluate if the volumetric characteristics of Chiari I after a ventriculoperitoneal shunt was due to a general volumetric reduction and if it is restricted to the posterior fossa. RESULTS: Our results show that the posterior fossa volume, cisternal, clival length, and posterior cranial fossa volume ratio were reduced in the shunted group compared to the controls (p<0.05). Cerebellar and supratentorial volumes were similar between both groups. Craniocaudal extent, inferior, and superior tonsillar herniations were greater in the shunted group than control (p<0.05). The frontal occipital horn ratio in both groups was within normal range. DISCUSSION: Chiari I anatomy after a ventriculoperitoneal shunt could develop in children and we propose a "posterior cranial fossa disproportion" rather than a "cephalocranial disproportion."
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