<s>[INST] I was diagnosed with fibromuscular dysplasia of the right internal carotid artery at the base of my skull. I was told 17 years ago the technology did not exist to do a bypass on the artery. Is the technology there now and do I need to have it rechecked? I have been on warfarin ever since to keep the blood as thin as possible. [/INST] Hi, Thank you for posting your query. I have noted your symptoms and treatment received so far. I think you are on correct treatment and warfarin should be continued for long to prevent any brain stroke. You could see your neurologist for review. I do not think that a bypass surgery is needed, as you are doing so well on medical treatment. I hope my answer helps. Please get back if you have any follow-up queries or if you require any additional information. Wishing you good health, Chat Doctor. Ly/ </s>