The position of an intracranial stent in relation to the ostium of a cerebral aneurysm can
significantly affect the blood flow characteristics through the ostium and inside the aneurysm.
An idealised cerebral artery and aneurysm were simulated with a pulsatile flow. Simulation
results show that the effect on mass inflow between two stent positions is about 20%
whereas the difference in the porosity effect of the pattern at these two positions is around
3%. The remainder may be attributed to differences in flow velocity profile across the stent
into the aneurysm. The implications for clinical practice are an important consideration as the
surgeon may place the stent in any position between the two investigated and hence this will
lead to markedly different stent performance. Therefore, computational tools that take into
account the variability of stent placement will be valuable for assisting surgical planning
