Fig. 1

Preoperative and intraoperative findings in case 1. A Preoperative head magnetic resonance imaging of the patient in case 1. B Under the endoscopic view, the trigeminal nerve was compressed into an angle by the SCA in the root entry zone. C The Teflon pads were placed between the trigeminal nerve and the SCA under the endoscopic view. The blue arrow indicated the trigeminal nerve compression by the offending vessel. SPV, superior petrosal vein; SCA, superior cerebellar artery; CN V, trigeminal nerve; Ten, tentorium; Pon, Pons