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The value of adding diffusion-weighted images for tumor detection and preoperative staging in renal pelvic carcinoma for the reader’s experience

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Abstract

Purpose

This retrospective study aimed to assess the value of adding diffusion-weighted magnetic resonance imaging (DWI) or gadolinium-enhanced fat-suppressed T1WI (CEI) to T2-weighted imaging (T2WI) for preoperative T categorization in renal pelvic carcinoma by the reader’s experience using surgical specimens as the reference standard.

Methods

Two radiologists (Reader 1; 3 years, 2; 13 years) reviewed 49 cases with urothelial carcinoma who underwent magnetic resonance imaging examination before surgery, independently, using three image sets: T2WI alone, T2WI plus DWI, and T2WI plus CEI for tumor detection and T categorization. The differences in the apparent diffusion coefficient values between tumors and renal parenchyma, histopathologic grade were analyzed.

Results

T2WI plus CEI or DWI had high detection rates (93.4%) compared to T2WI alone. When discriminating T3a/T3b, for Reader 1, the use of T2WI plus DWI (88.0%) and T2WI plus CEI (92.0%) was significantly more accurate than T2WI alone (73%), with AUCs of 0.86, 0.86 and 0.77, respectively. For Reader 2, the accuracies were high on all image sets, with AUCs of 0.87–0.95, and the mean ADC of the tumors was significantly lower than that of the normal renal parenchyma. In addition, the mean ADC values of high-grade tumors were significantly lower than that of low-grade tumors.

Conclusions

DWI and CEI could be more helpful than T2WI alone for preoperative T categorization by less-experienced reader and DWI could be used for preoperative T categorization and for predicting the histopathologic grade of renal pelvic carcinoma.

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Abbreviations

DWI:

Diffusion-weighted magnetic resonance imaging

CEI:

Gadolinium-enhanced fat-suppressed T1-weighted imaging

DCEI:

Dynamic contrast-enhanced imaging

T2WI:

T2-weighted imaging

MRI:

Magnetic resonance imaging

ADC:

Apparent diffusion coefficient

DICOM:

Digital imaging and communications in medicine

ROI:

Region of interest

ROC curve:

Receiver operating characteristic curve

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Correspondence to Rika Yoshida.

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Funding

No funding was received for this study.

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in the studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.

Informed consent

The Institutional Review Board approved the retrospective study protocol and all patients consented to the use of their medical records for research purposes.

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Yoshida, R., Yoshizako, T., Maruyama, M. et al. The value of adding diffusion-weighted images for tumor detection and preoperative staging in renal pelvic carcinoma for the reader’s experience. Abdom Radiol 42, 2297–2304 (2017). https://doi.org/10.1007/s00261-017-1116-5

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  • DOI: https://doi.org/10.1007/s00261-017-1116-5

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