“Fetal Hydronephrosis in the Second and Third Trimester of Pregnancy and Six Months Follow-up after Birth”: Letter to the Editor

Articles in Press

Document Type : letter to the Editor

Authors

1 pediatric. faculty of medicine. sabzevar university of medical science

2 Assistant Professor, Department of Community Medicine, Faculty of Medicine, Sabzevar University of Medical Sciences, Khorasan Razavi, Iran

10.22038/ijn.2026.85593.2642

Abstract

Infant follow-up is usually recommended only if the diameter of the pelvis of the fetal kidney is greater than a certain cut-off (e.g. 7 or 10 mm) at or more than 34 weeks. If the measurement is less, most of them consider physiologic or normalThe causes of fetal hydronephrosis include idiopathic, VUR, UPJO, UVJO, PUV, and ureterocele and 5-15% of infants with antenatal hydronephrosis have VUR. It seems that polycystic kidney disease (PCKD) is not a cause of fetal hydronephrosis, and there is a weak possibility of the two co-occurring. mortality from hydronephrosis is rare, except in cases of Potter syndrome. the duration of follow-up and differences in the causes of secondary hydronephrosis, including VUR, PUV, and UPJO, could be the reason for the difference in spontaneous recovery rates of fetal hydronephrosis in different studies. One of the main symptoms of severe kidney diseases is oligohydramnios, which is seen in cases of severe PUV, bilateral kidney dysplasia and Potter's syndrome and the combination of fetal hydronephrosis with oligohydramnios indicates a poor prognosis.

Keywords

Iranian Journal of Neonatology

Articles in Press, Accepted Manuscript
Available Online from 14 February 2026

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