Q. A 25-year-old woman comes to the clinic because of a 4-month history of increased hearing difficulties and dizziness. Her vital signs are normal. On clinical examination, there is an unsteady gait when the patient is asked to stand upright. There is no lateralization of sound on the Weber test, and velocity is greater than bone conduction velocity in both ears on the Rinee test. On clinical MRI, there are two 4-cm lesions on both cerebellopontine lesions. Which of the following can affect patients who have the same condition as this case?