Imaging recommendation · Abdomen · Pelvis

Posterior urethral valves follow-up (boy, post-resection)

Q: What's the alternative imaging for posterior urethral valves follow-up (boy, post-resection) when renal function assessment?

NM — MAG3 / DMSA renogram (iv contrast).

Recommended: Renal Ultrasound + VCUG for residual reflux is the preferred imaging study for posterior urethral valves follow-up (boy, post-resection). Bladder dysfunction and reflux may persist after valve ablation.

Recommended study

Renal Ultrasound + VCUG for residual reflux

US No contrast Preferred Abdomen · Pelvis Outpatient Reviewed 2026-05

Bladder dysfunction and reflux may persist after valve ablation. Long-term renal function monitoring.

If the default doesn't apply

Renal function assessment

NM MAG3 / DMSA renogram IV contrast

Watch-outs

Chronic kidney disease progression

PUV is leading cause of pediatric ESRD — monitor GFR, BP, growth.

Bladder dysfunction

'Valve bladder syndrome' — small capacity / high pressure persists; urodynamics in older children.

Pearls

VCUG demonstrates posterior urethral dilation + 'keyhole' bladder neck.
Renal damage often dates from in-utero obstruction.
Multi-D follow-up with pediatric urology + nephrology.