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The Urethra and Its Supporting Structures in Women with Stress Urinary Incontinence: MR Imaging Using an Endovaginal Coil

Jeong Kon Kim1, Yong Jae Kim2, Myoung Soo Choo2 and Kyoung-Sik Cho1

1 Department of Radiology, Asan Medical Center, University of Ulsan, 388-1 Poongnap-dong, Songpa-gu, Seoul, 138-736, South Korea.
2 Department of Urology, Asan Medical Center, University of Ulsan, Seoul, 138-736, South Korea.



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Fig. 1. Photograph and diagram of endovaginal coil. Coil, wrapped in supple rubber, was inserted into vagina so that entire urethra was covered. Inset diagram shows dimensions of coil.

 


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Fig. 2A. Normal anatomy of urethra and its supporting structures in 34-year-old continent woman. Axial T2-weighted fast spin-echo MR image obtained at level of approximately 30th percentile of urethra shows normal striated muscle, smooth muscle, and mucosa– submucosa layers of urethra. Normal periurethral and paraurethral ligaments, which maintain their tightness and can be traced along entire length without discontinuity, are shown. Symmetric puborectal sling is also noted.

 


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Fig. 2B. Normal anatomy of urethra and its supporting structures in 34-year-old continent woman. Drawing corresponds to A. SP = symphysis pubis, V = vagina, C = endovaginal coil, R = rectum, pr = puborectal sling, pa = paraurethral ligament, pe = periurethral ligament, st = striated muscle layer, sm = smooth muscle layer, m = mucosa–submucosa layer.

 


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Fig. 2C. Normal anatomy of urethra and its supporting structures in 34-year-old continent woman. Axial MR image obtained at approximately 50th percentile of urethra shows normal pubourethral ligament connecting urethra to arcus tendineus fasciae pelvis and caudal portion of periurethral ligament. Thickness of puborectalis sling, measured in 4- and 8- o'clock directions from urethra, is 4.2 mm in right limb and 3.8 mm in left limb. Therefore, mean thickness of puborectalis muscle is 4.0 mm and degree of asymmetry is 1.1.

 


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Fig. 2D. Normal anatomy of urethra and its supporting structures in 34-year-old continent woman. Drawing corresponds to C. SP = symphysis pubis, V = vagina, C = endovaginal coil, R = rectum, ATFP = arcus tendineus fasciae pelvis, pu = pubourethral ligament, pe = periurethral ligament, pr = puborectal sling.

 


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Fig. 2E. Normal anatomy of urethra and its supporting structures in 34-year-old continent woman. Sagittal T2-weighted fast spin-echo MR image obtained through long axis of urethra shows 117° vesicourethral angle (ag, intersecting lines) and retropubic space measuring 2.2 mm (r, arrows). BLD = urinary bladder, SP = symphysis pubis.

 


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Fig. 3A. Morphologic alteration of urethra and its supporting structures in 57-year-old woman with stress urinary incontinence. Axial T2-weighted fast spin-echo MR image obtained at level of approximately 30th percentile of urethra shows that striated muscle layer of urethra (arrowheads) is thin compared with normal muscle layer seen in woman imaged in Figure 2A. Fluttering periurethral ligament (straight arrows) and discontinuous paraurethral ligament (curved arrows) are evident. R = rectum, SP = symphysis pubis, V = vagina.

 


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Fig. 3B. Morphologic alteration of urethra and its supporting structures in 57-year-old woman with stress urinary incontinence. Axial MR image obtained at level of approximately 50th percentile of urethra shows discontinuous pubourethral ligament (arrows). R = rectum, SP = symphysis pubis, V = vagina.

 


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Fig. 4. Dot graph illustrates different distribution of degree of asymmetry of puborectal sling in continent group and in group with stress urinary incontinence. Most patients in both groups showed degree of asymmetry of less than 1.5. However, patients with degree of asymmetry equal to or greater than 1.5 are found only in group with stress urinary incontinence.

 


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Fig. 5. Axial T2-weighted fast spin-echo MR image obtained at level of approximately 50th percentile of urethra shows asymmetric puborectal sling (arrows) in 49-year old woman with stress urinary incontinence. SP = symphysis pubis, U = urethra, V = vagina, R = rectum.

 


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Fig. 3C. Morphologic alteration of urethra and its supporting structures in 57-year-old woman with stress urinary incontinence. Sagittal T2-weighted fast spin-echo MR image shows vesicourethral angle of 152° and retropubic space of 11 mm. BLD = urinary bladder, SP = symphysis pubis.

 


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Fig. 6. Dot graph reveals different distribution of scores for risk of stress urinary incontinence between continent group and group with stress urinary incontinence. Cutoff value = 1, sensitivity = 81.3%, and specificity = 95.2%.

 


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Fig. 7. Graph shows receiver operating characteristic curve for risk score of stress urinary incontinence. Area under curve = 0.930 (95% confidence interval, 0.850–0.975).

 

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