Thank you ! I thought the same. I have so so many questions
This answer isn't going to be too satisfying. It depends. Size, shape, location, patient history, sequence, etc. All of these things help to clarify what significance a lesion may or may not have.
Having said that, if MS had been behind your symptoms for over a decade, you'd expect to see more than a single lesion.
I recommend you get together a few questions and bring them with you to your appointment. Those things can feel like they pass in the blink of an eye, and it's easy to forget to ask important things!