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Figure 3. Case Two Illustration. (A-C)T2 flair images showed hyperintensity lesion in right middle cranial fossa. (D-F)Intraoperative images showed the second (V2) and third (V3) branch of trigeminal nerve adhered with tumor capsule, brown-yellowish tumor was exposed after tumor capsule opened. (G-I)HE staining showd epidermal cyst accompanyed with granulomatous reaction and cholesterol crystal formation, which had positive reaction with CK in IHC staining. (J-L) T2 flair images demonstrated no tumor residual and recurrence one year after operation.