My brother had a spinal tap and was diagnosed with ms. he said there are 4 types of ms. what are they and how do they differ?

See below: 85% of all cases relapsing/remitting, with ups and downs. 9% is primary progressive, steady slow progression without flares. 3-5% progressive relapsing, like above with flares. Secondary progressive, slow deterioration with/without relapses, after initial r/r form.

Let me explain: Multiple sclerosis (ms) is classified into four types, characterized by the disease's progression according to mayo clinic relapsing-remitting ms secondary-progressive ms primary-progressive ms progressive-relapsing.