Posterior urethral valves

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Hydronephrosis on US
  • Chronic urethral obstruction due to fusion and prominence of plicae colliculi, normal concentric folds of urethra
  • Abrupt transition on VCUG from dilated posterior urethra to small bulbous urethra at the level of the valves, actual valve tissue may not be visible
  • Exclusively males
  • Most common cause of bilateral hydronephrosis in a male infant
  • Thickened bladder wall
  • Associated with oligohydramnios, pulmonary hypoplasia and cystic renal dysplasia