骨髓外造血
答:骨髓外造血:当婴幼儿处于感染、急性失血或溶血等需要增加造血时(1分),肝、脾和淋巴结可随时适应等要,恢复到胎儿时期的造血状态,因而出现肝脾淋巴结增大。(1分)同时末梢血液中可出现有核红细胞或(和)幼稚中性粒细胞。(1分)
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