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01-10-2018 | Urogenital

Non-contrast-enhanced magnetic resonance angiography: a reliable clinical tool for evaluating transplant renal artery stenosis

Authors: Long Jiang Zhang, Jin Peng, Jiqiu Wen, U. Joseph Schoepf, Akos Varga-Szemes, L. Parkwood Griffith, Yuan Meng Yu, Shu Min Tao, Yan Jun Li, Xue Feng Ni, Jian Xu, Dong Hong Shi, Guang Ming Lu

Published in: European Radiology | Issue 10/2018

Abstract

Purpose

To evaluate image quality of non-contrast-enhanced magnetic resonance angiography (MRA) and compare transplant renal artery stenosis (TRAS) seen by non-contrast-enhanced MRA with digital subtraction angiography (DSA) as the gold standard.

Materials and methods

330 patients receiving 369 non-contrast-enhanced MRA examinations from July 2014 to June 2017 were included. Thirty patients received at least two MRA examinations. Image quality was independently assessed by two radiologists. Inter-observer agreement was analyzed. Transplant renal artery anatomy and complications were evaluated and compared with DSA. If possible, accuracy was calculated on a per-artery basis.

Results

Good or excellent image quality was found in 95.4 % (352/369) of examinations with good inter-observer agreement (K=0.760). Twenty-two patients with DSA had 28 non-contrast-enhanced MRA examinations within a 2-month period. Of these, 19 patients had TRAS, two patients had pseudoaneurysms, and one patient had a normal transplant renal artery but an occluded external iliac artery. Non-contrast-enhanced MRA correctly detected 19 TRAS and nine normal arteries, giving 96.6 % accuracy on a per-artery basis.

Conclusions

Non-contrast-enhanced MRA demonstrates a good depiction of the transplanted renal artery and shows good correlation with DSA in cases where there was TRAS.

Key Points

• Good or excellent image quality was found in 95.4 % of examinations.

• Non-contrast-enhanced MRA can clearly map transplant renal artery anatomy.

• Non-contrast-enhanced MRA is a reliable tool to detect TRAS.

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Title: Non-contrast-enhanced magnetic resonance angiography: a reliable clinical tool for evaluating transplant renal artery stenosis
Authors: Long Jiang Zhang
Jin Peng
Jiqiu Wen
U. Joseph Schoepf
Akos Varga-Szemes
L. Parkwood Griffith
Yuan Meng Yu
Shu Min Tao
Yan Jun Li
Xue Feng Ni
Jian Xu
Dong Hong Shi
Guang Ming Lu
Publication date: 01-10-2018
Publisher: Springer Berlin Heidelberg
Published in: European Radiology / Issue 10/2018
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-018-5413-3

At a glance: The STEP trials

Springer Medicine

Non-contrast-enhanced magnetic resonance angiography: a reliable clinical tool for evaluating transplant renal artery stenosis

Abstract

Purpose

Materials and methods

Results

Conclusions

Key Points

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Materials and methods

Results

Conclusions

Key Points

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