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Figure 2. Case One Illustration. (A)CT images showed enlargement of right oval foramen. (B-C)MRI images before gama knife therapy showed hypointensity T1 lesion was in right middle cranial fossa and enhanced heterogeneously after contrast. (D-F)MRI images after gama knife therapy demonstrated no obvious tumor decrease. (G-I)Intraoperative images showed enlarged oval foramen and grayish and yellowish tumor. (J-L) HE staining showed spindle shaped cells and stellate cells. IHC studies showed strong positivity for Vimintin and S-100.

图2 病例一示意图。(A) CT图像显示右侧卵圆孔扩大。(B-C) 伽马刀治疗前的MRI图像可见右侧颅中窝存在T1加权低信号病灶，对比剂增强后呈不均匀强化。(D-F) 伽马刀治疗后的MRI图像显示肿瘤无明显缩小。(G-I) 术中图像可见扩大的卵圆孔与灰黄色肿瘤组织。(J-L) HE染色可见梭形细胞与星状细胞。免疫组化（Immunohistochemistry，IHC）检测显示，波形蛋白（Vimentin）与S-100蛋白呈强阳性表达。