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, following a new mutation in the unfertilised egg. In others, DMD is inherited from a carrier mother, who is usually unaffected herself. A carrier mother has a oneinfour chance of having an affected son and a oneinfour chance of having a carrier daughter. 學(xué)齡前可發(fā)現(xiàn)的現(xiàn)象 Gower’s sign ? 骨盆及軀幹肌肉無(wú)力的現(xiàn)象 ? 常出現(xiàn)在 DMD的小孩 肌肉組織切片 脊椎變形 貝克型肌肉萎縮癥 Becker Muscular Dystrophy Symptoms: ? Generalized weakness and muscle wasting affecting limb and trunk muscles first. ? Calves often enlarged. ? Almost identical to Duchenne but often much less severe. ? Can be significant heart involvements. Onset: ? Adolescence or adulthood ? Progression: Disease progresses slowly and with variability but will affect all voluntary muscles. Survival well into mid to late adulthood ? Calf muscles initially enlarge (an attempt by the body to pensate for loss of muscle strength), but the enlarged mus