Hi, Kerri. To be really thorough, the neuro should have ordered a thoracic MRI too. However, many don't, because T-spine lesions are much less common than the others.
As to what symptoms they could cause, I think the answer is anything at that level or lower. At the same time, problems in the brain can cause pretty much anything in MS.
I know your brain MRI was significantly abnormal, even if it didn't comply with your neuro's narrow idea of MS lesions. This happens all the time when neuros don't have the courage of their convictions.
Your best plan, in my opinion, is to seek another doctor, and at that point ask for a thoracic MRI, just to cover all the bases. I'll bet though, that if he or she is worth his or her salt I(!), your brain MRI alone would be enough.
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