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Role of quantitative computed tomography texture analysis in the prediction of adherent perinephric fat

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Abstract

Objective

To assess the performance of computed tomography (CT) texture analysis to predict the presence of adherent perinephric fat (APF).

Materials and methods

Seventy patients with small renal tumors treated with robot-assisted partial nephrectomy were included. Patients were divided into two groups according to the presence of APF. We extracted 15 image features from unenhanced CT and contrast-enhanced CT corresponding to first-order and second-order Haralick textural features. Predictors of APF were evaluated by univariable and multivariable analysis. Receiver operating characteristic (ROC) analysis was performed and the area under the ROC curve (AUC) to predict APF was calculated for the independent predictors.

Results

APF was observed in 26 patients (37%). We identified entropy (p = 0.01), sum entropy (p = 0.02) and difference entropy (p = 0.05) as significant independent predictors of APF. In the portal phase, we identified correlation (p = 0.03), inverse difference moment (p = 0.01), sum entropy (p = 0.02), entropy (p = 0.01), difference variance (p = 0.04) and difference entropy (p = 0.02) as significant independent predictors of APF. Combining these parameters yielded to an ROC-AUC of 0.82 (95% CI 0.65–0.86).

Conclusion

Results from this preliminary study suggest that CT texture analysis might be a promising quantitative imaging tool that helps urologist to identify APF.

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Acknowledgements

Z.-E. Khene would like to thank the French Young Urological Association for his funding.

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Authors and Affiliations

Authors

Contributions

Z-EK, KB, AL, SS, GV, BP, OA, RD, RM: Project development. Z-EK, AL, RM, GV, BP: Data collection. Z-EK, KB, RM, SS, OA, RD: Data analysis. Z-EK, KB, AL, SS, GV, BP, OA, RD, RM: Manuscript editing.

Corresponding author

Correspondence to Zine‐Eddine Khene.

Ethics declarations

Conflict of interest

Karim Bensalah and Gregory Verhoest are consultants for Intuitive Surgical.

Ethical standard

Local ethics committee approval.

Informed consent

Informed consent was obtained from all individual participants included in the study. This study and all the related procedures have been performed in accordance with the Declaration of Helsinki.

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Khene, Z., Bensalah, K., Largent, A. et al. Role of quantitative computed tomography texture analysis in the prediction of adherent perinephric fat. World J Urol 36, 1635–1642 (2018). https://doi.org/10.1007/s00345-018-2292-9

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  • DOI: https://doi.org/10.1007/s00345-018-2292-9

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