多发性硬化是中枢神经系统白质脱髓鞘的自身免疫性疾病 ,具有迁延的、不规则的病程以及复发和缓解的倾向。起病常在中壮年早期 ,多在 2 0 4 0岁之间发病 ,很少在 1 0岁以下(3 % )及 50岁以上 (5 % )发病。国内报道 ,多发性硬化病灶多侵害视神经和脊髓 ,发生于延髓者罕见。以下 Multiple sclerosis is an autoimmune disease of demyelination of the white matter in the central nervous system, with a persistent, irregular course of disease and a tendency to relapse and remission. Often onset in mid-adulthood, mostly in the 2040 onset, rarely in the 10 years of age (3%) and 50 years of age (5%) incidence. Domestic reports, multiple sclerosis lesions more damage to the optic nerve and spinal cord, occurred in the medullary are rare. the following