Natural history of fetal hydronephrosis diagnosed on mid-trimester ultrasound

Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology
S SairamB Thilaganathan

Abstract

Renal tract dilatation is a common finding in routine prenatal ultrasound. However, there is no consensus as to the criteria used for differentiating pathological from physiological dilatation. The aim of this study was to evaluate the natural history and postnatal outcome of fetal hydronephrosis in an unselected obstetric population. This was a prospective study of fetal hydronephrosis, detected at 18-23 weeks' gestation, in a routine obstetric population. Fetal hydronephrosis was diagnosed as 'mild' if the antero-posterior renal pelvic diameter (APRPD) measured >or = 4 mm and as 'moderate/severe' if the APRPD measured > or = 7 mm or if there was associated calyceal dilatation. The postnatal outcome of fetuses with persistent hydronephrosis (> or = 10 mm in the third trimester) was determined from a postal questionnaire. During the study period, 11 465 women underwent an anomaly scan at 18-23 weeks of gestation. Fetal hydronephrosis was identified in 2.3% (268/11 465) of women. Mild hydronephrosis was present in 80.6% (216/268) and moderate/severe hydronephrosis in 19.4% (52/268). The hydronephrosis resolved in the antenatal or early neonatal period in 88% of fetuses. None of the fetuses with mild hydronephrosis and approximat...Continue Reading

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