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结外nk/t细胞淋巴瘤
结外nk/t细胞淋巴瘤
(血管中心性淋巴瘤):为细胞毒性细胞来源的侵袭性肿瘤。绝大多数发生在淋巴结外。镜下:可见肿瘤细胞穿入血管壁,导致呈葱皮样增厚,管径狭窄、闭锁。瘤细胞呈多形性,瘤细胞之间和坏死灶附近有明显急慢性炎细胞浸润。