患者，男，10岁，低热、乏力、消瘦3个月。査体：颈部、腋窝淋巴结如蚕豆大,肝脾轻度大。胸部X线：上纵隔增宽，双肺野尚清晰。血红蛋白132g/L，白细胞9x109/L,PLT210x109/L。PPD试验(-)。可能的诊断是

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