Question: Julie is a 46-year-old college professor who has experienced tinnitus and a slow loss of her hearing in her left ear over the past year and a half. Her neurologist ordered an MRI, which revealed a mass on the vestibular branch of her left VIIIth cranial nerve. Julie's neurologist counseled her that it would be best to monitor the growth of the tumor, but that a day might come when she might need to have it surgically removed. What type of brain tumor is the likely type in Julie's case?