Tip 158: antenatal renal pelvis dilatation 2

Antenatal renal pelvis dilatation is considered significant if the anteroposterior diameter is >5 mm in the second trimester or >7 mm in the third trimester and postnatally.

Ultrasound should also note:

  • renal size and parenchyma
  • ureteric and bladder dilatation
  • amniotic fluid volume

Reference: Rennie & Roberton’s Textbook of Neonatology, 5th Ed, 2005. London: Churchill.

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