3岁男孩，面色苍白1个月，发热2周，皮肤疲斑、瘀点1周。查体：皮肤黏膜苍白，双下肢可见瘀斑，双颈后各2个淋巴结花生米大小，心、肺正常，肝肋下3cm，脾肋下3cm。血常规：WBC20x109/L，RBC3.5x1012/L,Hb85g/L,PLT30x109/L。外周血涂片可见幼稚细胞，血小板分布稀疏。最可能的诊断是

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