Hi and welcome,
Just to set the record straight, 'benign MS' is very rare with incident rate said to be as little as 4% and by the definition it is the long term absence of symptoms and it can really only be accurately diagnosed in hindsight!
The use of the term benign has become very controversial with many MS specialising neurologists questioning whether benign MS even exists, benign MS is generally a subgroup of MS patients showing little disease progression and minimal disability 'decades' after disease onset, and is based mainly on changes in motor function over decades.
Technically to be dx with any type of MS you would still need to meet the MS diagnostic criteria, so unless those lesions (spots) on your MRI's over the last 10 years have been in MS suggestive-consistent locations and meets the latest McDonald diagnostic criteria for MS i would strongly suggest you take any benign MS comments from your neuro as meaningless.....and on the other hand IF your neuro was serious about the potential of you having benign MS because of your collective diagnostic evidence, he's at best an neglectful #^$&$ for not committing to dx-ing you with RRMS before theoretically categorising it as one of the rarest types, either way please consider it might be in your best interest to get the professional opinion of an MS specialising neuro!
I hope that helps.......JJ
You are more likely to be dealing with something other than a neurological condition like MS because your brain and spinal MRI's wouldn't generally put MS on your potential causation list....basically if your brain MRI's over a 10 year period are still coming up with "scattered Foci of hyper-intense T2 signal within the subcortical white-matter" MS is less likely to be the cause because scattered subcortical white matter hyperintensities (WMH) are typically micro vascular related.
Subcortical is not one of the 4 specific diagnostic locations required to be dx with MS and because you've never developed lesions in any other location over 10 years, it wouldn't be consistent with what typically happen's with the demyelinating disease process.
If no other identifying specifics are mentioned on the reports they're usually microscopic to 3mm in size, and these type of hyper-intensities are the most common non specific MRI findings.
You don't mention what, if anything, was abnormal with your neurological clinical exams but there might be something that is significant enough to indicate whether it's a central or a peripheral nervous system issue. You did say...."I had an abnormal visual evoked test 2 months ago" which depending on your results could be a clearer indication of what the 'something' might be, but if your results were only mildly abnormal though that could still be visual movement during testing so technically not abnormal...to give you an idea of abnormal causations;
"Prolongation of P100 latency on one side results from slowing of conduction in the optic nerve from that side. A delayed potential after stimulation of one eye (with a normal potential after stimulation of the other) implies a defect in conduction in the optic pathway anterior to the chiasm on that side.
Acute optic neuritis causes prolongation of P100 latency and is a common cause of monocular vision loss in young adults.
Also seen in optic neuritis, retrobulbar neuritis, anterior ischemic optic neuropathy, toxic amblyopia, vitamin B12 deficiency, leukodystrophies, vitamin E deficiency, Leber optic atrophy, and tumors compressing the optic nerve.
Compressive lesions of the optic nerve (eg, orbital tumor) may distort the P100 morphology and reduce the amplitude relative to the contralateral eye."
"the sensory test for my arms was also abnormal.....the name of the sensory test it might be called an SSEP." i know next to zero about the SEP/SSEP nerve testing, from what i understand though abnormal SSEP results of the somatosensory pathways involving both the upper limbs could be either central ie cord lesion or peripheral ie cord narrowing or compression (cervical spine stenosis) but understanding what means what i'm sorry i honestly don't have a clue, lol the evoke-potentials info explains it but i still don't get it...
Hope that helps a little........JJ