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Brazilian Journal of Health Review
Article . 2020 . Peer-reviewed
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Schwannoma Vestibular / Vestibular Schwannoma

Authors: Silva, João Vitor da; Cardoso, Victor Lucas de Santana; Rodrigues, Gerlan da Silva;

Schwannoma Vestibular / Vestibular Schwannoma

Abstract

Introducao: O schwannoma e um tumor benigmo que em geral acomete o nervo vestibulococlear, sede de 60-80% dos tumores no ângulo pontocerebelar. Essa neoplasia do acustico foi observada em autopsia e descrita pela primeira vez em 1777, pelo profesor Edward Sandiford. Histologicamente esse tumor deriva das celulas de schwann, sendo relacionado com disturbios cromossomicos, neurofibromatose e ausencia de supressao tumoral. Apresenta crescimento lento, 0,25 a 0,4 mm/ano, variando de acordo com a localizacao, sendo que os tumores intracanaliculares apresentam crescimento mais lento que os extracanaliculares. Quando microscopicos, apresentam-se assintomaticos ate a idade adulta. Entretanto, tumores nao tratados podem levar a compressao do tronco cerebral, aumento da pressao intracraniana e ate morte. Objetivo: Estabelecer uma revisao de literatura acerca das condutas neurocirurgicas pertinentes aos casos de schwannoma vestibular avaliando as possiveis complicacoes e o risco cirurgico lesivo de estruturas adjacentes. Metodologia: Procedeu-se a revisao sistematica por meio de pesquisa, sendo selecionados 20 artigos da base de dado SCIELO e Pubmed no periodo de 2007 a 2019. Resultados: As abordagens relacionadas ao schwannoma do oitavo par craniano sao indicadas quando se faz presente os efeitos compressivos sobre o tronco cerebral, sao elas; via fossa media, via suboccipital retrosigmoide e via retrolabirintica, todas indicadas para resseccao cirurgica completa do tumor. A tecnica de disseccao extracisternal foi mais comumente usada associada a abordagem suboccipital. A partir da craniotomia retrosigmoide e drenagem do liquor da cisterna magna, o conduto auditivo interno e aberto dando inicio a visualizacao do tumor, resseccao da capsula, postergando a regiao proximal do CAI devido sua maior aderencia, mantendo sempre integra a aracnoide como um marcador de limite anatomico com outras estruturas nervosas. Conclusoes: A preservacao da aracnoide mater como limite cirurgico esta relacionada com um menor risco de lesao do nervo facial, que compartilha trajetoria com o vestibulococlear pelo CAI, com 93% dos pos-operatorios tendo a funcao preservada ou disfuncao leve pela escala de House-Brackmann. Dessa forma, faz-se-a evidente a importância da escolha da abordagem, tecnica e pericia do neurocirurgiao, alem dos achados intraoperatorios, como fatores relacionados ao melhor prognostico diante dos schwannomas vestibulares.

Related Organizations
Keywords

neurocirurgia, Schwannoma vestibular, neurinoma., tumor vestibular

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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Average
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