HI Thanks for posting your query to Healthcaremagic Aneurysm is abnormal dilatation of the blood vessels. Carotid artery is the artery that supply blood to the brain . The complication any aneurysm can have is it can rupture causing catastrophic results, that too if the carotid artery aneurysm ruptures it can cause a severe stroke , brain hemorrhage or sometimes death. But there is nothing to worry , these Aneurysm can be clipped through neuro-radiological interventions and sometimes surgery. So don t get scared , get your self treated at Neurointerventional Radiology clinic. Hope you find this information useful. Any clarifications or Queries feel free to ask.