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Vol. 20. Issue 2.
Pages 110-116 (January 2009)
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Vol. 20. Issue 2.
Pages 110-116 (January 2009)
Características morfológicas de aneurimas cerebrales del polígono de Willis: estudio anatómico directo
Morphological characteristics of cerebral aneurysm of Willis’ circle: a direct anatomical study
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S.T. Quintero-Oliveros*,
, L.E. Ballesteros-Acuña*, J.O. Ayala-Pimentel*, P.L. Forero-Porras*,**
* Departamento de Ciencias Basicas. Universidad Industrial de Santander. Bucaramanga. Colombia
** Instituto de Medicina Legal y Ciencias Forenses. Bucaramanga. Colombia
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Resumen
Objetivo

Determinar la prevalencia y las características morfológicas de los aneurismas sin ruptura del círculo arterial del cerebro en una muestra de población mestiza colombiana.

Materiales y métodos

Mediante abordaje y canalización de las arterias carótidas comunes y vertebrales se realizó inyección de resina mezclada con rojo mineral a 125 encéfalos de individuos masculinos, entre 16 y 65 años, raza mestiza, a quienes se les practicó autopsia en el Instituto de Medicina Legal, Bucaramanga - Colombia. Se realizó exéresis y fijación de los encéfalos, posteriormente bajo lupa de aumento se identificaron los segmentos del círculo arterial del cerebro y las lesiones aneurismáticas ubicadas a este nivel.

Resultados

Se observaron nueve aneurismas en seis cerebros (4.8%); la localización mas frecuente fue el segmento supraclinoideo de la arteria carótida interna, con 4 casos (44.4%) de los cuales 3 se ubicaron en el origen de la arteria coroidea anterior. En la arteria comunicante anterior se localizaron 3 aneurismas (33.3%); los casos restantes se ubicaron, uno (11.1%) en el segmento precomunicante de la arteria cerebral anterior y otro en la bifurcación de la arteria basilar. La media del tamaño de las lesiones aneurismáticas fue de 2.49mm DS 0.37. Los encéfalos con aneurismas presentaron concomitantemente alguna variación en la configuración del círculo arterial del cerebro, con predominio de la hipoplasia de la arteria comunicante posterior.

Conclusiones

La prevalencia de aneurismas en la muestra evaluada es similar a lo informado en otros grupos poblacionales. Se destaca la presencia de aneurismas en el origen de la arteria coroidea anterior, localización señalada en la literatura como poco frecuente.

Palabras clave:
Anatomía vascular
Aneurismas cerebrales
Polígono de Willis
Raza mestiza
Abreviaturas:
(ACA)
(ACI)
(ACP)
(AcoA)
(AcoP)
(PW)
Summary
Objective

To determine the prevalence and morphologic characteristics of unruptured aneurysms of Willis’ circle in a sample of mestizo Colombian population.

Materials and methods

A mixture of resin and mineral red was injected into cerebral arteries by dissection and canalization of common carotids and vertebral arteries of the encephalons of 125 mestizo male cadavers of 16 to 65 years old. The procedure was carried out during the autopsy course at the Legal Medicine Institute, Bucaramanga - Colombia. Then the encephalons were extracted and fixed. After that, the Willis’ circles were identified and the presence of aneurysms at this level was determined with magnifying glass.

Results

A total of nine aneurysms were observed in six brains (4.8%). The most frequent location was the supraclinoid segment of the intern carotid artery, with 4 cases (44.4%), three of which were localized in the origin of the anterior choroidal artery. Additionally, three aneurysms were found in the anterior communicating artery (33.3%). From the remaining cases, one (11.1%) was localized in the pre-communicating segment of the anterior cerebral artery, and the other in the bifurcation of the basilar artery. The average size of the aneurysms was 2.49mm SD 0.37. The affected encephalons presented concomitant variations of the Willis’ circle configuration, being predominant the presence of hypoplasic posterior communicanting arteries.

Conclusion

The aneurysm prevalence in the evaluated sample was similar to the reported in other populations. In this work, the presence of aneurysms on the origin of the anterior chorioid artery, an unusually reported localization, was prominent.

Key words:
Vascular anatomy
Cerebral aneurysm
Circle of Willis
Mestizo population

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