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Prolonged CT urography in duplex kidney.

Honghan Gong1, Lei Gao2, Xi-Jian Dai2

  • 1Department of Radiology, the First Affiliated Hospital of Nanchang University, 17 Yongwai Zheng Street, Donghu District, Nanchang, Jiangxi, 330006, China. honghan_gong@sina.com.

BMC Urology
|May 15, 2016
PubMed
Summary

Prolonged computed tomography urography (CTU) effectively diagnoses duplex kidney anomalies. This extended imaging phase aids in visualizing duplicated ureters and affected kidney parenchyma, overcoming limitations of standard CTU.

Keywords:
Duplex kidneyDuplicated uretersMulti-slice spiral CT urographyProlonged-delay contrast enhancement

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Area of Science:

  • Medical Imaging
  • Urology
  • Radiology

Background:

  • Duplex kidney is a common congenital anomaly often leading to complications.
  • Standard four-phase computed tomography urography (CTU) can be insufficient for diagnosing duplex kidneys with prolonged dilatation.
  • Affected parenchyma and tortuous ureters in duplex kidneys may show delayed or absent opacification on typical CTU.

Purpose of the Study:

  • To evaluate the efficacy of prolonged-delay CTU in diagnosing duplex kidney anomalies.
  • To improve the visualization of duplicated ureters and affected renal parenchyma in duplex kidneys.

Main Methods:

  • Seventeen patients with suspected duplex kidney underwent prolonged CTU, including a delayed phase (1-72 hours).
  • Standard unenhanced and four-phase CTU were compared with the prolonged-delay CTU.
  • Diagnosis was confirmed using axial and 3D CT reconstructions from the prolonged CTU scans.

Main Results:

  • Unenhanced CTU showed only irregular perirenal morphology.
  • Standard four-phase CTU could not confirm duplex kidney diagnosis in affected patients.
  • Prolonged CTU, particularly the delayed phase, successfully opacified duplicated ureters and confirmed the diagnosis.

Conclusions:

  • Prolonged CTU is a valid and effective method for evaluating duplex kidney anomalies.
  • This technique aids in assessing the function of affected parenchyma and demonstrating urinary tract malformations.
  • Extended imaging protocols enhance diagnostic accuracy for complex renal anomalies.