Acta Neurochirurgica

, Volume 153, Issue 2, pp 305–310

Influence of parent vessel dominancy on fluid dynamics of anterior communicating artery aneurysms

  • Tamer Hassan
  • Amr Ali Hassan
  • Yaser Mohamed Ahmed
Experimental research

DOI: 10.1007/s00701-010-0824-1

Cite this article as:
Hassan, T., Hassan, A.A. & Ahmed, Y.M. Acta Neurochir (2011) 153: 305. doi:10.1007/s00701-010-0824-1



Parent vessel plays an important role in aneurysm formation and rupture. The diameter of either the A1 arteries is the peculiar key controlling the flow of the anterior communicating artery (ACOMA) aneurysms (ANs).


The purpose is to study the effect of parent vessel dominancy, that is, the diameter of the A1 artery, on the flow characteristics of the ACOMA ANs.


Numerical simulations for the flow patterns in six artificial models have been studied. Three models are designed with aneurysms and three models without. The two A1s were equal in two models. In the other two models, the nondominant A1 diameters were decreased by 50%. Again, the nondominant A1s were decreased by another 50% in the last two models. Each pair was designed with and without aneurysms in the ACOMA.


The ACOMA shows lower velocity magnitudes and wall shear stresses when the two A1s are equal. However, if one A1 is dominant with a 50% difference from the other A1, there is higher shear stress on the ACOMA itself and in the inflow zone of the aneurysm that increases more with further reduction of the nondominant A1 by another 50%. An area of high corner pressure at the bifurcation of the dominant A1 into the ACOMA and A2 exists and increases in value with the decrease of diameter of the other nondominant A1.


Aneurysms located in the ACOMA with differences of 50% or more between the two A1s are subjected to more flow stresses.


Fluid dynamicsAneurysmParent vesselA1Anterior communicating artery

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Tamer Hassan
    • 1
  • Amr Ali Hassan
    • 2
  • Yaser Mohamed Ahmed
    • 3
  1. 1.Department of NeurosurgeryAlexandria University School of MedicineAlexandriaEgypt
  2. 2.Marine Engineering Department, College of EngineeringArab Academy for Science, Technology and Maritime Transport (AASTMT)AlexandriaEgypt
  3. 3.Department of Naval Architecture and Marine Engineering, Faculty of EngineeringAlexandria UniversityAlexandriaEgypt