Pantos is correct, Sibyle. Migraines (as well as other conditions) can cause lesions, and generally it is the size/shape/location that might HELP determine if the are of the "MS" variety.

Pantos' feedback on "more than one neurologic event separated in space" is also correct.

MS is basically a dx of exclusion, whereby if we present with a number of suspect symptoms, they will try to rule out everything else first. They will be looking for certain markers; lesions, "O" bands in our spinal fluid, evoked potentials results (as well as other testing results). However, there is no single test that "proves" we have MS.

If x + x + x exists, and there is no other logical explanation, then we may get dx with "possible/probable" MS (rather outdated terminology, but they still seem to do it this way...). In time, if we have similar symptoms that "pop up" again, then they will often retest to look for changes. That is when we often get the dx, but this can take years.

Cherie