Out of the 4 main types of MS, PPMS Multiple Sclerosis can be identified by its lack of relapses and the prominent findings seen in MRIs of RRMS patients. The continuation of a decline in function after the initial diagnosis of MS is the main characteristic of Primary Progressive Multiple Sclerosis. Besides lacking in relapses, Primary Progressive MS must also have 2 of the following: a positive MRI scan with lesions on the brain, the spinal cord, or a positive spinal tap. The presence of T2 lesions on the spinal cord must total at least 2. T2 lesions are the ones that show up as bright spots on an MRI scan.

When scanning the brain for T2 lesions, there needs to be at least 9 visible or 4 visible and positive VEP as well. Visual Evoked Potential or Response is created as the eyes look at a test pattern and …