重症肌无力是一种自身免疫性疾病 ,病变主要累及神经肌肉接头处突触后膜乙酰胆碱受体 ,表现为一组或多组骨骼肌异常疲劳无力。大量研究表明 ,重症肌无力的发病与胸腺关系密切 ,15 %～ 30 %合并胸腺增生或胸腺瘤[1] 。以往本病的治疗以药物为主 ,近年来 ,国内外开展以胸腺切除为 Myasthenia gravis is an autoimmune disease mainly involving the postsynaptic acetylcholine receptor at the neuromuscular junction, manifested as one or more groups of skeletal muscles with abnormal fatigue. A large number of studies have shown that the incidence of myasthenia gravis is closely related to the thymus, 15% to 30% with thymus hyperplasia or thymoma [1]. In the past the treatment of this disease mainly drugs, in recent years, at home and abroad to carry out thymectomy