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Obliterative urethral stricture: MR urethrography versus conventional retrograde urethrography with voiding
Deuk Jae Sung1, Yun Hwan Kim, Sung Bum Cho
1Department of Radiology, College of Medicine, Korea University, Anam Hospital, 126-1, 5-Ka Anam-dong, Sungbuk ku, Seoul 136-705, Korea.
Radiology
|July 22, 2006
Summary
Magnetic resonance (MR) urethrography accurately measures obliterative urethral stricture length. This advanced imaging technique offers superior precision compared to conventional methods, aiding surgical planning for urethral strictures.
Area of Science:
- Urology
- Radiology
- Medical Imaging
Background:
- Obliterative urethral stricture diagnosis and length assessment are critical for effective surgical management.
- Conventional imaging techniques like retrograde urethrography (RGU) and voiding cystourethrography (VCUG) have limitations in accurately determining stricture length.
- Accurate preoperative assessment of stricture length is essential for successful surgical reconstruction.
Purpose of the Study:
- To prospectively evaluate the efficacy of magnetic resonance (MR) urethrography in depicting and measuring obliterative urethral strictures.
- To compare the accuracy of MR urethrography with conventional RGU/VCUG for estimating stricture length against surgical findings.
Main Methods:
- Twelve patients with obliterative urethral stricture underwent preoperative MR urethrography using T2-weighted, T1-weighted, and contrast-enhanced T1-weighted sequences.
- The urethra was distended with sterile lubricating jelly during MR imaging.
- Ten patients also underwent conventional RGU combined with VCUG; imaging results were compared with surgical specimens or findings.
Main Results:
- MR urethrography measurements of stricture length showed significantly lower errors compared to conventional RGU/VCUG (P < .05).
- MR imaging demonstrated a better linear fit to surgical measurements (r(2) = 0.85, P < .001) than RGU/VCUG (r(2) = 0.03, P > .05).
- MR urethrography proved to be an effective tool for evaluating obliterative urethral strictures.
Conclusions:
- Magnetic resonance urethrography is a highly accurate method for assessing the length of obliterative urethral strictures.
- MR urethrography offers superior precision over conventional RGU/VCUG, improving the preoperative evaluation of urethral strictures.
- The technique of distending the urethra with sterile lubricating jelly facilitates effective MR imaging for stricture evaluation.
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