L'hermittes occurred w/o other ms symptoms. mri of c spine & brain clear. vep ok. but- lumbar puncture detected bands. what are chances of having ms?

Fairly high, but: There are other causes for lhermitte's such as vitamin b-12 problems, and even lyme disease. Make certain that other potential disorders are excluded. Although the oligoclonal bands correlate very highly with ms, other immune disorders could cause presence. Maybe check peripheral nerve function on a screening emg, just to be sure. Most docs would do followup MRI in 6 months.