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Background and Objectives:Vestibular schwannomas are intracranial neoplasms that compres adjacent structures as their volume grows. Although the clinicaly relevant parameter is most likely tumor volume, curent clinical decisions are based on two-dimensional measurements of tumor diameter. This study was conducted to introduce a new software for accurate Material and Method:Twenty-eight patients who had no previous treatment before MRI were included in this study. Diameter of the vestibular schwannoma was measured according to AAO guidelines and spherical volume was calculated from the diameter. For the accurate volume measurement of the vestibular schwannoma, we used a new software (Rapidia, 3D Med Co) deve-loped in Korea. Paired t-test was used for the statistical analysis of correlation between the measured and calculated volumes. Results: (p=0.120). However, as tumor size increased greater than 2 cm in diameter, our measured volume result was smaller than the calculated volume, although statistically not significant (p=0.067). Conclusion:These results were due to tumor configuration, which was wider in the axial plane than in the longitudinal plane. From these results, we can realize that initial tumor growth was sp-herical, and as the size increased, it was distorted by the adjacent structures. These results suggest that special attention is (Korean J Otolaryngol 2002;45:451-5)