Abstract:Objective To investigate the value of bladder neck descent(BND) and levator hiatus area by transperineal real-time three-dimensional ultrasound in the diagnosis of female stress urinary incontinence(SUI).? Methods Transperineal real-time three-dimensional ultrasound was performed in 31 female SUI patients (case group) and 20 asymptomatic patients (control group) from August 2015 to October 2016. BND and levator hiatus areawere respectively calculatedas the maximum Valsalva movement.? Results There was no statistical difference in the position of bladder neck in resting state between two groups (P＞0.05). The bladder neck position [(-0.91±5.75) mm vs (12.42±2.25)mm] and BND［(28.92±6.66)mm vs (15.24±3.09)mm] in maximum Valsalva state were significantly larger than those in control group(all P<0.01). The levator hiatus areas in both resting state and Valsalva state in case group were significantly lager than those in control group［(14.39±1.97)cm² vs (12.44±1.87)cm², (24.52±4.09)cm² vs (17.98±3.11)cm², all P<0.01].? Conclusion BND and levator hiatus area in maximum Valsalva movement have important value in the diagnosis of female SUI.