Stepwise renal pelvis diameter reduction on ultrasound after pediatric pyeloplasty

After pediatric pyeloplasty, renal pelvis AP diameter on US reduces by 30% at 2 months and 60% at 6 months; cortical thickness improves by 63% at 2 years but often remains below normal.

• Prospective multicenter study of 31 children (median age 6.5 months) who underwent pyeloplasty.
• Median APD reduction: 30% at 2 months, 60% at 6 months, 71.4% at 2 years (IQR 40.9–82.5%).
• Cortical thickness increased from 4.9 mm to 8 mm (63% increase) at 2 years, but typically did not reach normal values.

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