A controversy exists concerning whether or not roentgenographic abnormalities of the vestibular aqueduct is a specific sign for Meniere's disease. The radiographic observations of the vestibular aqueduct of 143 patients(286 ears) were analyzed from 1986 to 1988. The purpose of this study is to seek correlation between computed tomographic visibility of the vestibular aqueduct and degree of the perilabyrinthine pneumatization and correlation between abnormally visualized vestibular aqueduct and Meniere's disease. The results were as follows : 1) In 170 ears(59.4%) of the cases, vestibular aqueducts of the both side were the same visibility even though unilateral diseased ear. 2) Of 122 ears that were evaluated except chronic otitis media, high degree of perilabyrinthine pneumatization was 83.6% of the cases, medium degree was 11.5%, and low degree was 4.9% 3) The aqueduct was visible in 79.4% of the well pneumatized ears and in 90.0% of the diploic or sclerotic ears(p>0.1). 4) Abnormal aqueducts were seen 15.9% of ears with non-Meniere's diseased ear, 19.4% of normal ears, and 66.7% of ears with Meniere's disease(p>0.01). We conclude that statistically significant correlation was not found between the different grades of pneumatization and the visibility of the aqueduct, and definite differences in the radiographic visibility of the vestibular aqueduct when comparing healthy subjects and patients with Meniere's disease exist.