Posterior urethral valves in male infants and newborns: detection with US of the urethra before and during voiding

Radiology
C D GoodC Dicks-Mireaux

Abstract

To document the appearance and width of the posterior urethra with transperineal ultrasound (US) before and during voiding in male infants and newborns with posterior urethral valves. Thirty-three patients with bilateral hydronephrosis underwent prospective transabdominal and transperineal US. Fifteen patients had proved posterior urethral valves (obstructed group); 18 patients had no obstruction (unobstructed group). In the obstructed group, the median posterior urethral width was 4.5 mm before and 10.0 mm during voiding. In the unobstructed group, the median posterior urethral width was 1.0 mm (P = .046) before and 4.0 mm (P < .001) during voiding. Bladder wall thickness was 3.0-7.6 mm (obstructed group) and 2.0-5.0 mm (unobstructed group; P < .001). With a posterior urethral diameter of at least 6 mm during voiding as a criterion for transperineal US diagnosis of obstruction, sensitivity was 100%; specificity, 89%; and positive predictive value, 88%. Transperineal voiding US is noninvasive and useful in diagnosing posterior urethral valves.

Citations

Oct 1, 2007·Indian Journal of Urology : IJU : Journal of the Urological Society of India·Pramod P Reddy
Sep 18, 2002·Radiographics : a Review Publication of the Radiological Society of North America, Inc·Teresa BerrocalJulia Gutiérrez
Nov 10, 2013·Pediatric Radiology·Jennifer K Son, George A Taylor
Nov 5, 1999·Radiologic Clinics of North America·D E Blews
Jul 2, 2003·European Radiology·Alejandro MatéMaria José Bello
May 19, 2009·Pediatric Radiology·Michael Riccabona
Jul 13, 2004·Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine·Helmut SchoellnastMichael Riccabona
Nov 5, 1997·Pediatric Clinics of North America·J S Elder
Aug 14, 2021·Pediatric Radiology·Carol E BarnewoltMaciej Piskunowicz

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