6岁男孩，面色苍白20天，皮肤出血点、牙龈出血2周。査体：贫血貌，全身皮肤散在出血点，牙龈轻微出血，浅表淋巴结无肿大，心、肺正常，腹平软，肝脾未触及。血常规WBC1.5x109/L,Hb60g/L,PLT25xlO9/L,MCV82fl,外周血涂片白细胞、红细胞形态正常，血小板分布稀疏。最可能的诊断是

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