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aneurysm at the A1 and A2 segment

I have been having migraines so went for an MRI. The results say I have a 2.5mm aneurysm at the junction of the right A1/2 segment, directed posteromedially. Can you please tell me exactly what this means? Where in my brain is this? How long are A1 and A2 segments? I have to see a Neurologist, but have been googling to try and find out what this means as I can't concentrate on anything else at the moment.

Thanks
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Avatar universal
Thanks for responding. I appreciate your response
Helpful - 0
351246 tn?1379682132
MEDICAL PROFESSIONAL
Hi!
I can understand your worries but it may be difficult to explain where exactly the aneurysm is. The anterior cerebral artery starts at the optic chiasm (at the bottom of the brain where optic nerve crosses) and extends to the medial surface of cerebral cortex. Its first part arising from internal carotid artery is A1 segment is about 14mm long. Next is the A2 segment.
If the headaches are linked to the aneurysm, then only it will be operated upon. Please consult your doctor regarding this. Take care!

The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.
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