Hello. Thanks for asking from HCM. I can understand your concern. Best of wishes for your treatment. As you are going to be operated by endovascular approach, most probably doctor will either do coiling with/without stunting or flow diversion therapy. You are having some basic knowledge about it which is good. Endovascular approach has few advantages over open surgery like : Rapid recovery and return to work. You will be able to return to work after 7 to 10 days. But mental and physical stress should be avoided. As first 3 to 6 months are required for complete thrombosis and occlusion of aneurysm, so be careful. : No scar over scalp which means no complications of scarring/headache due to it/wound infection or suture problems. : No handling of brain which means no direct brain damage. Few side effects and important points should be kept in mind and should be taken care : Puncture site over femoral artery in thigh needs proper attention. Whenever visit to doctor, show it to rule out any occurrence of pseudoaneurysm or hepatoma : If stent or flow diverter will be placed, then you may require blood thinner tablets for long time. Do not stop tablets on your own. : Get repeat angiography done after 6 months to look for any residual aneurysm or recurrence. : During procedure, few side effects like damage to major arteries can occur like dissection. Thrombus formation which a clot can occur. It can migrate and block supply to specific area of brain. Aneurysm rupture can happen which may require open surgery. Dye allergy or kidney damage from dye can occur. Hope it will help you. Thanks. Take care. Dr Ishu Bishnoi