Results: The 23 cases were misdiagnosed at first visit. That the case was ( aty-) pical, inquiring the medical history was not detailed, the cognition of the disease was lack and the laboratory examinations were misled were common misdiagnosis causes. 结果:23例初诊病例全部误诊,病例不典型、询问病史不详细、对本病缺乏认识及实验室检查的误导为常见误诊原因。