Prevalência das variações anatômicas no círculo arterial do cérebro (polígono de Willis) e possíveis repercussões clínicas: Revisão Integrativa.

Prevalência das variações anatômicas no círculo arterial do cérebro (polígono de Willis) e possíveis repercussões clínicas: Revisão Integrativa.

• Autor
• Gabriel das Chagas Benevenuto
• Co-autores
• Gustavo Maia de Faria , Ana Clara Camillato e Silva , Georje de Martin , Kennedy Martinez de oliveira , Valério Landim de Almeida
• Resumo

• Prevalence of anatomical variations in the arterial circle of the brain (Willis polygon) and possible clinical repercussions: Integrative Review.

   

  Keywords: Willis polygon, Anatomical variation, Abnormalities (source: MeSH-NLM)

   

  Introduction: The cerebral arterial circle, usually called “Circle of Willis”, is an anastomotic arterial circulation located internally in the base of the skull and the encephalon which supplies the brain and adjacent structures. The normal Circle of Willis mitigates the process of ischemia through collateral circulation in cases of obstructions or stenosis. However its frequent anatomic variations can reflect clinically in those pathological cases.Objective: Search the prevalence of the anatomic variations in the cerebral arterial circle and its possible clinical repercussions.Method: Integrative review of literature made in the data bases PubMed, Scielo and Lilacs. The vocabulary thesaurus used were “circle of willis” and “anatomic variation”, indexed in the Medical Subject Heading, using the boolean operator “AND” to cross the terms with each other and its matching in portuguese and spanish. Were included only studies made between 2010 and 2020 and discarded case report or non-human studies.Summary of results: Twenty one articles were found, but only eleven were selected. The analysis of the studies allowed to agroup them regarding the prevalence of the location of the anatomic variations and the clinic repercussions associated to the variations. Were identified variations in both parts of the Circle of Willis, anterior and posterior, with predominance of the findings in the posterior portion. In this, hypoplastic and absence of the posterior communicating artery or posterior fetal-type artery were common findings. Some variations can intefere in circulation’s symmetry, in diagnosis and in the treatment of strokes, besides potentially be a risk factor for aneurysm.Conclusions: Although they don’t have obligatorily pathological character, the knowledge of the cerebral artery circle variations may help in the diagnosis and treatment of cerebrovascular’s diseases.

• Palavras-chave
• Polígono de Willis, Variação anatômica, Anormalidades
• Área Temática
• Ciência Básica

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