6.间质有丰富的血管网结构,亦可透明变性,偶尔间质水肿,可见砂粒体形成;
7.约5%的表现出恶性组织学特征,存在以下2个或以上特征提示恶性:肿瘤直径>5cm, 浸润性生长,弥漫的细胞非典型性,核分裂象>3个/10HPF, 血管浸润和/或存在肿瘤性坏死。
2.间质细胞增生:通常为镜下表现,直径<0.5cm,罕见表现为占位性病变,但通常为多灶性增生;
3.成人颗粒细胞瘤:Melan-A通常阴性;
4. 软斑病:累及生精小管和间质细胞,黄色肉芽肿性间质反应,病变细胞内可见特征性的Michaelis-Gutmann小体;
5. 卵黄囊瘤:瘤细胞核较幼稚,核分裂象多,免疫组化表达SALL4。
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