Hi Leathan:
Yes, I think it is. Here is how I was diagnosed:
After first being diagnosed with the symptoms of speech, numbness, hand tremors, weakness, balance, hand-eye coordination, etc., I was to go to the hospital for IV steroid treatment three weeks later. Gradually within that three week period my symptoms went away, except for the weakness and slight speech and hand-writing problems. Even though my symptoms relapsed on their own, I still took the steroid treatments. I was amazed how they all went away after that.
So, I would say "Yes" that you could have good reflexes and good balance, but still show lesions on your MRI. Maybe you have Relapsing-Remitting MS(what I have), and your symptoms come and go.
What made you get an MRI, what were your symptoms?
I hope I helped you at least a little. Let me know.
Andrea