Localized distention of the prostatic urethra proximal to posterior urethral valves (PUVs), as seen on voiding cystourethrography (VCUG) (Fig. 1), has been described as the “spinnaker sail” sign (Fig. 2) [1]. The distended portion of the urethra assumes the characteristic configuration of a spinnaker sail, used for sailing “off the wind.” PUVs are the most common congenital obstructive lesion of the urethra, occurring almost exclusively in male children [2]. PUVs represent a membrane caused by an anterior fusion of two abnormal folds, originating from Wolffian duct remnants, that descend from the verumontanum into the more distal prostatic urethra [2]. PUVs may present as acute urinary obstruction in infancy or in adolescence with renal disease, poor urinary stream, urinary incontinence, or urinary tract sepsis [3]. VCUG is the best imaging technique for the diagnosis of posterior urethral valves. Diagnostic features of PUV include a dilated posterior urethra with an abrupt transition into normal caliber anterior urethra, associated bladder distension with thick irregular bladder wall, and hydroureteronephrosis [2].
×
×
…
Anzeige
Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten