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Published in: Pediatric Nephrology 5/2024

02-12-2023 | Urography | Original Article

Non-contrast-enhanced magnetic resonance urography for measuring split kidney function in pediatric patients with hydronephrosis: comparison with renal scintigraphy

Authors: Kangwen He, Dongyi Wan, Shichao Li, Guanjie Yuan, Mengmeng Gao, Yunfeng Han, Zhen Li, Daoyu Hu, Xiaoyan Meng, Yonghua Niu

Published in: Pediatric Nephrology | Issue 5/2024

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Abstract

Background

Split kidney function (SKF) is critical for treatment decision in pediatric patients with hydronephrosis and is commonly measured using renal scintigraphy (RS). Non-contrast-enhanced magnetic resonance urography (NCE-MRU) is increasingly used in clinical practice. This study aimed to investigate the feasibility of using NCE-MRU as an alternative to estimate SKF in pediatric patients with hydronephrosis, compared to RS.

Methods

Seventy-five pediatric patients with hydronephrosis were included in this retrospective study. All patients underwent NCE-MRU and RS within 2 weeks. Kidney parenchyma volume (KPV) and texture analysis parameters were obtained from T2-weighted (T2WI) in NCE-MRU. The calculated split KPV (SKPV) percent and texture analysis parameters percent of left kidney were compared with the RS-determined SKF.

Results

SKPV showed a significant positive correlation with SKF (r = 0.88, p < 0.001), while inhomogeneity was negatively correlated with SKF (r =  − 0.68, p < 0.001). The uncorrected and corrected prediction models of SKF were established using simple and multiple linear regression. Bland–Altman plots demonstrated good agreement of both predictive models. The residual sum of squares of the corrected prediction model was lower than that of the uncorrected model (0.283 vs. 0.314) but not statistically significant (p = 0.662). Subgroup analysis based on different MR machines showed correlation coefficients of 0.85, 0.95, and 0.94 between SKF and SKPV for three different scanners, respectively (p < 0.05 for all).

Conclusions

NCE-MRU can be used as an alternative method for estimating SKF in pediatric patients with hydronephrosis when comparing with RS. Specifically, SKPV proves to be a simple and universally applicable indicator for predicting SKF.

Graphical Abstract

Appendix
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Metadata
Title
Non-contrast-enhanced magnetic resonance urography for measuring split kidney function in pediatric patients with hydronephrosis: comparison with renal scintigraphy
Authors
Kangwen He
Dongyi Wan
Shichao Li
Guanjie Yuan
Mengmeng Gao
Yunfeng Han
Zhen Li
Daoyu Hu
Xiaoyan Meng
Yonghua Niu
Publication date
02-12-2023
Publisher
Springer Berlin Heidelberg
Published in
Pediatric Nephrology / Issue 5/2024
Print ISSN: 0931-041X
Electronic ISSN: 1432-198X
DOI
https://doi.org/10.1007/s00467-023-06224-1

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