Fig. 1

(A) Magnetic resonance imaging scans of VS (4 years before the patient’s first visit to our clinic) (well-defined mass involving the left cerebellopontine angle) (white arrow: vestibular schwannoma affecting the left trigeminal nerve, arrow head: right trigeminal nerve) (B) Magnetic resonance imaging scans from the postoperative period (white arrow: left trigeminal nerve, arrow head: right trigeminal nerve)