PURPOSE: To evaluate the usefulness of introital ultrasonography in the assessment of female urinary incontinence. MATERIALS AND METHODS: Introital ultrasonography was performed in fifteen patients with stress urinasy incontinence(mean age 50) and six patients without symptoms of incontinence(mean age 37). Using a sagittalsection of the anterior pelvis in the plane of the symphysis pubib the posterior rethrovesical angle, the pubourethral distance and the pubo-yretgrak abgle were measured at rest and during stree(Valsalva's maneuverstate). The student T-test and the ANOVA test were used in statistical analysis. RESULTS: The posterior urethrovesical angles of the controls were 125.3 ° (± 10.9) at rest and 125.7 ° (±7.6) during stress. In thepatients, the corresponding angles were 135.3 ° (±11.3) and 139.6 ° (±10.8). The posterior urethrovesical angles increased 0.3 ° (±4.7) in the controls and 5.6 ° (±4.0) in the patients(p=0.018). In the controls, thepubo-urethral distances were 21.8mm(± 5.8) at rest and 18.2mm(±7.1) during stress, while in the patients thesedistances were 18.4mm(±3.9) and 12.6mm(±4.4). The pubo-urethra distance decreased 3.5mm(±1.5) in the controls and 5.8mm(±2.3) in the patients(p=0.039). In the patients with mild incontinence(Gradel), the posterior urethrovesical angles increased 3.4 ° (±2.8) : 132.3 ° (±12.5) at rest and 135.6 ° (±12.8) during stress. In the patients with moderate incontinence(Grade II), the angles increased 8.1 ° (±3.8) : 136.0 ° (±6.5) at rest and 144.1 ° (±5.9) during stress. The change of the posterior urethrovesical angle was related to the grade of urinary incontinence in the patients(p<0.05). There was no statistical significancy in the pubo-urethral angle(p=0.315). CONCLUSION: Introital ultrasonography may be useful for assessment of stress urinary incontinence.