Duchenne progressive muscular dystrophy (DMD): 1, is due to a mutation in the DMD gene that causes progressive muscle cell damage and necrosis throughout the body. 2, generally for boys with the disease. 3, generally late toddler; running, jumping, upstairs difficulties; generally after 12 years old can not walk. 4.Walking with a duck walk; calf gastrocnemius muscle hypertrophy, hard to touch; Gowers disease positive. 5.Creatine kinase (CK) test is significantly increased, the normal is within 200, the affected children are generally more than 5000, sometimes up to 30,000. 6, transaminases will be elevated, some patients are therefore misdiagnosed as liver disease. 7. Electromyography shows myogenic damage.