男性,64岁,因低热.乏力3月余就诊,两侧颈部可触及多个蚕豆大小淋巴结,脾肋下2cm,RBC4.25×10_TagUpStart_12_TagUpEnd__TagUpStart__TagUpEnd_/L.Hb134g/L,WBC19.1×10_TagUpStart_9_TagUpEnd_ /L,白细胞分类:中性分叶核细胞15%.中性杆状核细胞2%.淋巴细胞83%,PLT152×10_TagUpStart_9_TagUpEnd__TagUpStart__TagUpEnd_/L。骨髓象:增生明显活跃,以淋