Neonatal hydronephrosis

Dr Bruno Di Muzio and Dr Henry Knipe et al.

Neonatal hydronephrosis is most commonly diagnosed antenatally as fetal pylectasis, and in the majority of cases is due to pelvi-ureteric junction (PUJ) obstruction.  

  • renal pelvis AP diameter of >7-10 mm is considered significant 3,4; this is not absolute and varies by institution
  • calyceal dilatation is present in more severe hydronephrosis

Estimated incidence of neonatal hydronephrosis that has clinical significance is 1 in 600 and most cases will resolve without intervention 5

  • normal physiologic filling of the renal collecting system 6
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Article information

rID: 36967
Section: Pathology
Synonyms or Alternate Spellings:

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