Expected headings
"Associations"
"Antenatal ultrasound"
"Postnatal ultrasound"
"Voiding cystourethrogram (VCUG)"
"Posterior urethral valves result from the formation of a thick, valve-like membrane from a tissue of Wolffian duct origin (failure of regression of the mesonephric duct 5) that courses obliquely from the verumontanum to the distalmost portion of the prostatic urethra. This is thought to occur in early gestation (5-7 weeks 6). The valve is a diaphragm with a central pinhole; however, as it is more rigid along its line of fusion, it gradually distends into a bilobed sail-like or windsock-shaped structure 1-3."
"in severe cases, oligohydramnios and renal dysplasia 2 (assessing the degree of renal dysplasia is difficult antenatally, although some authors believe that significantly increased echogenicity of the kidneys is an indication of poor function 2,5)"
"The overall prognosis is most affected by the degree and duration of obstruction. Severe cases with obstructive cystic renal dysplasia, oligohydramnios and pulmonary hypoplasia are often incompatible with life 2."