Which just goes to show there isn't a single definition and it depends on the neurologist (s) in question as to what it means.
This link below is to the longest and possibly biggest MS study concerning what is benign MS and comes up with very different results to the Mayo and subscribes to the earlier treatment the better philosophy
Scroll down to Benign MS part
'Conclusions: In the population of BMS defined as either EDSS <=2 or EDSS <=3 at 10 y, a majority of these patients had a worsening of their disability when they are followed at 20 and 30 y and so did not deserve the term of benign MS. Benign MS is a questionable entity.'
I am wary of using the EDSS as the singular measure of disability in MS. According the EDSS my level of disability has only twice gone above 0.0 and that was to only 1.0.
Does this mean I have benign MS? Maybe to some neuros and not to others, maybe to some people who look on from the outside but not to me. I would be pretty cross with myself if I lulled myself in to believing I did because that would lead, for me, to complacency. Once you stop making the effort to fight then you stop living the best that you can whatever the box people put you into.