The clinical application of CT scan and MRI together with the progress of neurootological examinations has changed the clinical profile of acoustic neuromas. The clinical records of 102 patients with acoustic neuroma examined at the University of Tokyo Hospital between 1984 and 1993 were reviewed. Patients seen between 1989 and 1993 showed smaller tumor size, lower incidence of neurological signs and central neuro-otological findings, and shorter diagnostic delay than those between 1984 and 1988. Small and early tumors with changed profile and few symptoms must not be overlooked.
