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Title: Non-invasive assessment of kidney allograft fibrosis with shear wave elastography : a radiological-pathological correlation analysis
Authors: Ma, MKM
Law, HKW 
Tse, KS
Chan, KW
Chan, GCW
Yap, DYH
Mok, MMY
Kwan, LPY
Tang, SCW
Choy, BY
Chan, TM
Keywords: Chronic allograft nephropathy
Shear wave elastography
Issue Date: 2018
Publisher: John Wiley & Sons
Source: International journal of urology, May 2018, v. 25, no. 5, p. 450-455 How to cite?
Journal: International journal of urology 
Abstract: ObjectivesTo evaluate the use of shear wave elastography in assessment of kidney allograft tubulointerstitial fibrosis.
Methods Shear wave elastography assessment was carried out by two independent operators in kidney transplant recipients who underwent allograft biopsy for clinical indications (i.e. rising creatinine >15% or proteinuria >1g/day). Allograft biopsies were interpreted by the same pathologist according to the 2013 Banff Classification.
Results A total of 40 elastography scans were carried out (median creatinine 172.5mol/L [interquartile range 133.8-281.8mol/L]). Median tissue stiffness at the cortex (22.6kPa [interquartile range 18.8-25.7kPa] vs 22.3kPa [interquartile range 19.0-26.5kPa], P=0.70) and medulla (15.0kPa [interquartile range 13.7-18.0kPa] vs 15.6kPa [interquartile range 14.4-18.2kPa]) showed no significant differences between the two observers. Interobserver agreement was satisfactory (intraclass correlation coefficient of the cortex 0.84, 95% CI 0.70-0.92 and intraclass correlation coefficient of the medulla 0.88, 95% CI 0.78-0.94). The areas under the receiver operating characteristic curves for detection of tubulointerstitial fibrosis were estimated to be 0.75 (95% CI 0.61-0.89), 0.85 (95% CI 0.75-0.95) and 0.65 (95% CI 0.53-0.78) for cortical, medullary tissue stiffness and serum creatinine, respectively.
Conclusions Shear wave elastography can be used as a non-invasive tool to evaluate kidney allograft fibrosis with reasonable interobserver agreement and superior test performance to serum creatinine in detecting early tubulointerstitial fibrosis.
ISSN: 0919-8172
EISSN: 1442-2042
DOI: 10.1111/iju.13536
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