Numerical hemodynamic analysis of rupture risk in growing stages of middle cerebral artery aneurysms with coiling

In this paper, the hemodynamic study of the blood flow inside the middle cerebral artery (MCA) aneurysm in different stages of aneurysm growth is done via a numerical approach. This paper has tried to evaluate the hemorrhage of the aneurysm through the growth process. Two modified scale-down geometries of the original giant patient-specific MCA cases are created and investigated to show how the evolution of the MCA aneurysm changes the hemodynamics inside the sac region. The effects of coiling treatment on these preliminary stages are also investigated. The modeling of the blood flow inside the cerebral aneurysms is done by solving transient Navier–Stokes equations. The distribution of wall shear stress (WSS) and oscillatory index has also been examined in these preliminary models. Our findings show that the shear stress increases by more than 50% from the initial aneurysm size to reduced models. The results of hemodynamic investigation of MCA evolution indicate that the performance of coiling treatment in the initial stages would be more effective and hemorrhage risk reduced substantially when the aneurysm size is small.