著者报导了4例特征一致的选择性肌萎缩和无力,病理证实慢性肌炎,激素治疗有暂时疗效.年龄分别为53、54、56、65岁,3男1女,发病以来随访6～14年.4例均为隐伏起病,首发症状是下肢力弱,上下楼均需用手协助,从坐椅上立起困难,但由仰卧位坐起无困难.同时期逐渐觉前臂屈力和握力差,检查发现,4例均见股四头肌下1/3显著萎缩 The authors reported 4 cases of selective muscle atrophy and weakness consistent with the same characteristics, pathological confirmed chronic myositis, hormone therapy have a temporary effect.Agents were 53,54,56,65 years old, 3 males and 1 female, the incidence of follow-up of 6 to 14 Year .4 cases were hidden onset, the first symptom is lower limb weak, up and down the stairs are required to help hand, stand up from the chair difficult, but no difficulty sitting from the supine position at the same time gradually feel the forearm flexion and Poor grip, the test found that 4 cases were seen under the quadriceps significantly shrinkage