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患儿，男，11 a，因双眼睑浮肿半月入院。两面颊隐约皮疹，不发热，无关节痛，无口腔粘膜溃疡，无神经精神症状。尿常规阴性，血BUN 20 mmol/L，Cr 120 μmol/L。血Hb 85 g/L，RBC 2.8×1012/L，WBC 1.9×109/L，PLT 80×109/L，血沉 105 mm/1h。CH50未检出，C3 0.14 g/L，C4 0
Children, male, 11 a, due to double eyelid edema admitted to hospital for half a month. Vague rashes on both cheeks, no fever, no joint pain, no oral mucosal ulceration, no neuropsychiatric symptoms. Urine routine negative, blood BUN 20 mmol / L, Cr 120 μmol / L. Blood Hb 85 g / L, RBC 2.8 × 1012 / L, WBC 1.9 × 109 / L, PLT 80 × 109 / L, erythrocyte sedimentation rate 105 mm / 1h. CH50 not detected, C3 0.14 g / L, C4 0