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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.