MR urethrography versus X-ray urethrography compared with operative findings for the evaluation of urethral strictures.

Abstract

We compared the accuracy of magnetic resonance (MR) urethrography and X-ray urethrography with operative findings for urethral strictures and observed their effects on treatment. A total of 87 male patients (10-85years of age) treated from January 2015 to December 2016 were included in the study. X-ray and MR urethrograms were performed for all patients to determine the location, length, and degree of urethral strictures and the organizational structure around the urethra, and the results were compared with the operative findings. One-way analysis of variance (ANOVA) was performed to compare the lengths of the urethral strictures determined by the two methods with the operative findings. A value of P < 0.05, calculated using GraphPad software, indicated statistical significance. Urethral stricture was more clearly shown on MR urethrography than on X-ray urethrography. The stricture length measured by conventional X-ray urethrography [(2.17 ± 0.65)cm] was much longer than that measured by MR urethrography [(1.68 ± 0.67)cm]. The surgical findings [(1.66 ± 0.70)cm] were significantly different from X-ray urethrography findings (F = 24.660, P = 0.000), but no significant difference was observed between the surgical findings and the stricture length measured by MR urethrography (F = 0.040, P = 0.842). Urethral strictures can be displayed more clearly and accurately by MR urethrography than by X-ray urethrography. MR urethrography is expected to become a necessary and standard procedure for the preoperative examination of urethral strictures.