“…1) Patients with petrous bone involvement may present with sensorineural hearing loss, 2,5,8) vertigo, 2,5,21) and facial nerve palsy. 2,4,8,20) Sensorineural hearing losses in previous cases have been chronic, 21) fluctuating, 5) or progressive, 8) whereas the present case showed sudden onset of hearing loss. Extension of the lesion to the skull base may cause palsy of other cranial nerves such as the abducens, [2][3][4]8,11,13) trigeminal, 4) optic, 11) and vagus 2) nerves.…”