Saccular aneurisms, swelling of a blood vessel,
are investigated in order (i) to estimate the development risk of
the wall lesion, before and after intravascular treatment,
assuming that the pressure is the major factor,
and (ii) to better plan medical interventions.
Numerical simulations, using the finite element method,
are performed in three-dimensional aneurisms.
Computational meshes are derived from medical imaging data
to take into account both between-subject and within-subject
anatomical variability of the diseased vessel segment.
The 3D reconstruction is associated with a faceted surface.
A geometrical model is then obtained to be finally meshed
for a finite element use.
The pulsatile flow of incompressible Newtonian blood is
illustrated by numerical simulations carried out
in two saccular aneurism types,
a side- and a terminal-aneurism.
High pressure zones are observed in the aneurism cavity,
especially in the terminal one.