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Bladder cancer local staging: multiparametric MRI performance following transurethral resection

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Abstract

Purpose

To evaluate the performance of multiparametric MRI (mpMRI) for the local staging of bladder cancer following transurethral resection of bladder tumor.

Methods

This Institutional Review Board-approved, retrospective study identified 45 patients with pathology-proven bladder cancer who underwent transurethral resection followed by mpMRI between August 2011 and October 2016. Two radiologists reviewed each MRI independently and assigned T and N stage. Sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and accuracy were calculated for the presence of muscle invasion (T2 or higher), peri-vesical invasion (T3 or higher), and regional nodal disease compared to findings at cystectomy as the reference standard. Inter-observer agreement was measured using Cohen’s κ coefficient.

Results

Of 45 patients, 13% were stage T2, 27% T3, 16% T4; of 40 patients, 28% had regional nodal disease. Sensitivity, specificity, PPV, NPV, and accuracy of mpMRI for readers 1 and 2, respectively, were muscle invasion, 92% and 88%, 74% and 84%, 81% and 88%, 88% and 84%, 84% and 86%; peri-vesical invasion, 72% and 67%, 92% and 92%, 87% and 86%, 81% and 79%, 83% and 81%; regional nodal disease, 45% and 45%, 93% and 90%, 71% and 63%, 82% and 81%, 80% and 78%. Inter-observer agreement was good using all sequences.

Conclusions

mpMRI was both sensitive and specific in the detection of muscle invasive bladder cancer, and was specific but not sensitive for both peri-vesical invasion and nodal involvement. mpMRI may have a role at locally staging bladder cancer following transurethral resection.

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Corresponding author

Correspondence to Atul B. Shinagare.

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Funding

No funding was provided for this study.

Conflict of interest

Dr. Atul B. Shinagare is a consultant for Arog Pharmaceuticals, and receives research funding from GTx, Inc. Christian B. van der Pol, Sree Harsha Tirumani, Mark A. Preston, Mark G. Vangel, Stuart G. Silverman declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the Institutional and/or National Research Committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

Informed consent

This retrospective image review study was approved by the Institution Review Board with a waiver of informed consent for retrospective image analysis.

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van der Pol, C.B., Shinagare, A.B., Tirumani, S.H. et al. Bladder cancer local staging: multiparametric MRI performance following transurethral resection. Abdom Radiol 43, 2412–2423 (2018). https://doi.org/10.1007/s00261-017-1449-0

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