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  • Review Article
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Renal tract malformations: perspectives for nephrologists

Abstract

Renal tract malformations are congenital anomalies of the kidneys and/or lower urinary tract. One challenging feature of these conditions is that they can present not only prenatally but also in childhood or adulthood. The most severe types of malformations, such as bilateral renal agenesis or dysplasia, although rare, lead to renal failure. With advances in dialysis and transplantation for young children, it is now possible to prevent the early death of at least some individuals with severe malformations. Other renal tract malformations, such as congenital pelviureteric junction obstruction and primary vesicoureteric reflux, are relatively common. Renal tract malformations are, collectively, the major cause of childhood end-stage renal disease. Their contribution to the number of adults on renal replacement therapy is less clear and has possibly been underestimated. Renal tract malformations can be familial, and specific mutations of genes involved in renal tract development can sometimes be found in affected individuals. These features provide information about the causes of malformations but also raise questions about whether to screen relatives. Whether prenatal decompression of obstructed renal tracts, or postnatal initiation of therapies such as prophylactic antibiotics or angiotensin blockade, improve long-term renal outcomes remains unclear.

Key Points

  • Renal tract malformations can present not only prenatally, but also in childhood or adulthood

  • Histological diagnoses of kidney malformations are rarely obtained in live patients, so radiological assessments such as ultrasonography and renography are commonly used to inform diagnosis

  • Renal tract malformations are, collectively, the major cause of childhood end-stage renal disease

  • Renal tract malformations can be familial, and specific mutations of renal tract developmental genes can be found in some affected individuals

  • It is unclear whether either prenatal decompression of obstructed renal tracts or therapies initiated in childhood improve renal outcomes in adulthood

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Figure 1: Diagram of normal and abnormal kidney development.

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Acknowledgements

L Kerecuk is supported by a Medical Research Council Clinical Training Fellowship. MF Schreuder is supported by Fellowships from the Sophia Children's Hospital Foundation and from the European Renal Association–European Dialysis and Transplantation Association. Charles P Vega, University of California, Irvine, CA, is the author of and is solely responsible for the content of the learning objectives, questions and answers of the Medscape-accredited continuing medical education activity associated with this article.

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Correspondence to Adrian S Woolf.

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Kerecuk, L., Schreuder, M. & Woolf, A. Renal tract malformations: perspectives for nephrologists. Nat Rev Nephrol 4, 312–325 (2008). https://doi.org/10.1038/ncpneph0807

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