Hello Oswiu and welcome to NeuroTalk.
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I'm thinking either a congenital anomaly or a white matter lesion due to the migraines
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Migraines can and do cause lesions. Lesions can also be congenital, due to an infection or injury.
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no other symptons whatsoever
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That's actually a good thing

If another opinion is needed for the both of you to have peace of mind then by all means, get another opinion. If that opinion isn't any different than what you have already heard it's very possible that lesion doesn't have any serious significance.
Best wishes to the both of you