Tip 57: posterior urethral valves

In bilateral antenatal renal pelvis dilatation, an urgent ultrasound scan is needed after birth to look for residual significant renal pelvis dilatation (over 10mm) and any dilated ureter or thickened bladder wall that may signify posterior urethral valves. A normal stream of urine does not rule out posterior urethral valves.

Reference: Rennie & Roberton’s Textbook of Neonatology, 5th Ed, 2012. London: Churchill.

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