Even leaving aside the clinical definitions, some pathologysts consider that MS is the presence of demyelinated scars in the CNS tissue while others consider that MS is the unknown underlying condition that produces those scars.
MS is the presence of demyelinated scars in the CNS tissue. This is what some pathologysts consider. MS is the unknown underlying condition. This is what others consider. This is what some pathologysts consider. This unknown underlying condition produces those scars.