This is a classic case of subdural hematoma that contains many accumulated benign nucleated and heterogeneous white blood cells. Sometimes these cells are distributed in a vague laminar or layered fashion, or are concentrated on the surface of hematomas. Looking at them under high power microscopy shows them to be heterogeneous (some are mononuclear while others polymorphonuclear, some are lymphoid/monocytic while others are myeloid, band forms and mature eosinophils may be abundant), but none display cytologic/nuclear atypia seen in usual lymphoproliferative disorders. Mitotic figures may be found, and small collections of extramedullary hematopoiesis are common. While many cells in the photos appear plasmacytoid with round nuclei and eosinophilic eccentric cytoplasm, these cells do not have the characteristics of plasma cells. Plasmacytoma and chloroma do occur in the meninges, so it is important to rule these entities out by doing immunohistochemical stains if component cells appear very monotonous. This case, however, raises no suspicion for malignancy in me.

 漂亮，不会看。

 学习

 似乎是淋巴造血系统肿瘤，有免疫组化结果吗？

 淋巴瘤吗

 淋巴瘤或粒细胞肉瘤？

 淋巴瘤或粒细胞肉瘤？

同意

 淋巴造血系统病变，看起来是肿瘤性的；

有很多的浆细胞，会不会是浆细胞瘤或弥漫大B细胞淋巴瘤？

要确定是肿瘤性病变，一定要做做kappa，lamda

 见大量胞浆嗜酸核偏位的细胞弥漫分布,考虑为浆细胞,能不能再给一个高倍.

 应该是浆细胞瘤  背景不复杂

 浆细胞瘤