病例1患儿,男,4个月。因发现血小板减少4月余,咳嗽50 d,发热4 d入院。患儿4个月前(生后2 d)发现血小板减少(PLT 22×109/L),外院经骨髓细胞学检查诊断为血小板减少性紫癜,口服泼尼松及静脉丙种球蛋白治疗,血小板正常后出院。出院后不规律口服泼尼松,2个月前停用,血小板波动于50~60×109/L。50 d前开始咳嗽,胸片示肺炎,予地塞米松、美罗培南2周,4 d前咳 Case 1 children, male, 4 months. Due to the discovery of thrombocytopenia more than 4 months, 50 days cough, fever 4 d admission. Children with thrombocytopenia (PLT 22 × 109 / L) 4 months ago (2 days after birth), thrombocytopenic purpura outside the hospital by bone marrow cytology, oral prednisone and intravenous gamma globulin treatment, normal platelets After discharge. Irregular oral prednisone after discharge, disabled 2 months ago, platelet fluctuations in 50 ~ 60 × 109 / L. 50 days before the onset of cough, chest X-ray showed dexamethasone, meropenem 2 weeks, 4 d before cough