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Archives of Disease in Childhood - Fetal and Neonatal Edition 1999;80:F135-F138; doi:10.1136/fn.80.2.F135
Copyright © 1999 BMJ Publishing Group Ltd & Royal College of Paediatrics and Child Health.
Arch Dis Child Fetal Neonatal Ed 1999;80:F135-F138 ( March )

Prospective study of outcome in antenatally diagnosed renal pelvis dilatation

Mervyn S Jaswon,a Laraine Dibble,a Sheila Puri,a Jacky Davis,b Jane Young,b Raj Dave,b Heulwen Morganc

a Department of Paediatrics Whittington Hospital NHS Trust Highgate Hill, London N19 5NF, b Department of Radiology, c Department of Obstetrics and Gynaecology

Correspondence to: Dr Jaswon.


Accepted 11 September 1998

AIMS---To ascertain the outcome associated with antenatal renal pelvis dilatation; to recommend guidelines for postnatal investigation and determine an upper limit of normal for the anterioposterior dimensions of the fetal renal pelvis.
METHODS---Infants whose antenatal ultrasound scan showed a fetal renal pelvis of 5 mm or greater were investigated using postnatal renal tract ultrasound and a micturating cystogram. Isotope studies were also performed, where appropriate.
RESULTS---Vesicoureteric reflux (VUR), the most common diagnosis, was evident in 23/104 (22%). In 14 infants with VUR the postnatal ultrasound scan was normal. There was no evidence of renal scarring or dysplasia in any of the refluxing kidneys. Other diagnoses were pelviureteric junction obstruction, renal dysplasia, and idiopathic dilatation. Antenatal counselling and parental information facilitated postnatal assessment.
CONCLUSIONS---Infants with antenatal renal pelvis measurements of 5 mm or greater should be investigated postnatally, as a significant percentage will have VUR. A normal postnatal ultrasound scan does not preclude the presence of VUR.

Keywords: vesicoureteric reflux; antenatal renal pelvis dilatation; renal tract anomalies; prenatal diagnosis

© 1999 by Archives of Disease in Childhood
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