Neonatal hydronephrosis

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

The 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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rID: 36967
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