A14-year-oldright-handedboywasevaluatedforfluctuatingweaknessandfatigue.Hehadnormalmotormilestones.Atage3years,itwasfirstnoticedthathewasnotabletokeepupwithotherchildrenandhaddifficultyrunning.Whenhewas9yearsold,hissymptomsprogressed,witheasyfatigabilityandfrequentfalls.Oneofthestrikingfeaturesofhisweaknesswasdaytodayvariability.Somedayshewouldbeabletoperformmostofhisdailyactivitiesandsomedayshecouldbarelywalk.Inaddition,hehadepisodesofsevereweaknessfollowingfebrileorviralillness,wherehewouldbe白癜风如何治疗比较好北京治疗白癜风好的正规医院