title: Upward Translation of Cerebellar Tonsils following Surgical Expansion of Supratentorial Cranial Vault: A Unified Biomechanical Explanation of Chiari Type I.
abstract: Cerebellar tonsils moved significantly upward in 3 patients with Chiari type I who underwent supratentorial cranial vault expansion to alleviate intracranial pressure related to multisutural craniosynostosis. The Chiari type I deformities in these patients were the biomechanical consequence of posterior fossa-cerebellar disproportion caused by supratentorial craniocerebral disproportion secondary to multisutural craniosynostosis. The authors postulate that all cases of Chiari type I deformity share the sine qua non feature of posterior fossa-cerebellar disproportion.
authors.forename: Ken R
authors.initials: KR
authors.lastname: Winston
authors.forename: Nicholas V
authors.initials: NV
authors.lastname: Stence
authors.forename: Arianne J
authors.initials: AJ
authors.lastname: Boylan
authors.forename: Kathryn M
authors.initials: KM
authors.lastname: Beauchamp
mesh_terms: D001139:Arnold-Chiari Malformation / Q000473:pathology*; D001696:Biomechanical Phenomena; D002531:Cerebellum / Q000473:pathology*; D002648:Child; D003388:Cranial Fossa, Posterior / Q000473:pathology*; D003398:Craniosynostoses / Q000601:surgery*; D003399:Craniotomy / Q000379:methods*; D006801:Humans; D007223:Infant; D008297:Male; D016896:Treatment Outcome