Congenital Urinary Tract Dilatation and Obstructive Uropathy

  • Josef Oswald
  • Bernhard Haid
Part of the Medical Radiology book series (MEDRAD)


The reported incidence of upper urinary tract dilatation (UTD) is 1–5.4 % of all pregnancies, dependent on the diagnostic criteria that are being applied, accounting to 60–120,000 children being diagnosed per year in the USA (Mallik and Watson 2008). Of these, around 25 % are persistent throughout birth (Barbosa et al. 2012). Sonographically detected intrauterine UTD can be observed in varying degrees in the 18th to 20th week of gestation. A prognostic cutoff level of prenatally diagnosed UTD on the basis of many studies has been determined; the risk of a significant UTDs after birth was linked to its prenatal manifestation (Nguyen et al. 2010): Whereas children with an anteroposterior renal pelvis diameter of ≥15 mm have a risk of 75 % of persistence after birth, in children with an anteroposterior renal pelvis diameter of ≤9 mm, it amounts to only 10 % (Benfield et al. 2003). The risk for later surgery is connected also with the grade of the prenatal urinary tract dilatation (Fig. 1).


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© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Pediatric UrologyHospital of the Sisters of CharityLinzAustria

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