1　病例报告患儿 ,男 ,6岁 ,因双下肢肌无力 2年 ,双足穿鞋困难 1年 ,右下肢行走跛行半年入院。于 2年前无诱因起病 ,双下肢无力 ,左侧为著 ,进行性加重 ,1年后双下肢均无力。近 1年双足穿鞋困难 ,足尖不能抬起。走路姿态异常 ,近半年行走跛行 ,易跌倒。双上肢无异常。双下肢无 A case report in children, male, 6 years old, due to weakness of the lower extremity muscle for 2 years, difficulty wearing shoes for 1 year, walking limp in the right lower limb for half a year. Two years ago, no incentive to onset, both lower extremities weakness, left to, progressive increase in one year after both lower extremities were weakness. Nearly 1 years difficult to wear shoes, toes can not lift. Abnormal walking posture, walking limp nearly half a year, easy to fall. No abnormalities in both upper extremities. No lower limbs