Fig. 2

Preoperative and intraoperative findings in case 2. A Preoperative head magnetic resonance imaging of the patient in case 2. B Under the EF-SCITA view, a solid tumor was seen behind the SPV. C The tumor was dissected from the MC. D Endoscopic full view of the EF-SCITA after the operation. The blue arrow indicated the tumor in the PA extending to the MC. SPV, superior petrosal vein; SCA, superior cerebellar artery; Ten, tentorium; Pon, Pons; PA, petrous apex; MC, Meckel’ cave; CN IV, trochlear nerve; CN V, trigeminal nerve; CN VII-VIII, acoustic-facial bundle