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Arquivos de Neuro-Psiquiatria

Print version ISSN 0004-282X

Arq. Neuro-Psiquiatr. vol.73 no.2 São Paulo Feb. 2015 


Surgical treatment of type I Chiari malformation: the role of Magendie’s foramen opening e tonsils manipulation

Tratamento cirúrgico da malformação de Chiari do tipo I: importância da abertura do forame de Magendie e manipulação das tonsilas

Claudio Henrique Fernandes Vidal1 

1Resumo da Tese de Doutorado apresentada ao programa de Pós-Graduação em Neuropsiquiatria e Ciência do Comportamento da Universidade Federal de Pernambuco, Centro de Ciências da Saúde. Área de Neurocirurgia. 2014. Recife PE, Brasil


The treatment for type 1 Chiari malformation (CM 1) is one of the most controversial topics in the neurosurgical field. The present study evaluated two of the most applied surgical techniques to treat CM 1.


32 patients were evaluated and divided in two groups: group 1 had 16 patients that were submitted to decompression of occipital bone and dura mater of the craniovertebral junction (CVJ); group 2 also had 16 patients and in addition to the previous procedure, they were submitted to Magendie’s foramen opening e tonsils manipulation. The comparison between the groups included neurological exam and cerebrospinal fluid flow imaging during pre and postoperative periods.


Both techniques were equivalents in terms of neurological improvement of the patients (p > 0.05), but the group 2 had more surgical complications, with relative risk of 2.45 (CI 1.55-3.86) for adverse events. Whatever the cerebrospinal fluid flow at CVJ, the patients of the group 1 achieved greater amount of flow than the group 2 (p < 0.05) during the postoperative period.


The cranial and dural decompression of the CVJ without arachnoidal violation was the best surgical intervention for treatment of CM 1, between these two compared techniques.

Key words: Arnold-Chiari malformation; syringomyelia; cranial fossa; posterior

Received: September 29, 2014; Revised: October 10, 2014; Accepted: October 30, 2014

Correspondence: Claudio Henrique Fernandes Vidal; Rua Francisco da Cunha, 206; 51020-041 Recife PE, Brasil; E-mail:

Orientador: Marcelo Moraes Valença.

Creative Commons License This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.