Abstract
Purpose
PI-RADS v2 dictates that dynamic contrast-enhanced (DCE) imaging be used to further classify peripheral zone (PZ) cases that receive a diffusion-weighted imaging equivocal score of three (DWI3), a positive DCE resulting in an increase in overall assessment score to a four, indicative of clinically significant prostate cancer (csPCa). However, the accuracy of DCE in predicting csPCa in DWI3 PZ cases is unknown. This study sought to determine the frequency with which DCE changes the PI-RADS v2 DWI3 assessment category, and to determine the overall accuracy of DCE-MRI in equivocal PZ DWI3 lesions.
Materials and Methods
This is a retrospective study of patients with pathologically proven PCa who underwent prostate mpMRI at 3T and subsequent radical prostatectomy. PI-RADS v2 assessment categories were determined by a radiologist, aware of a diagnosis of PCa, but blinded to final pathology. csPCa was defined as a Gleason score ≥ 7 or extra prostatic extension at pathology review. Performance characteristics and diagnostic accuracy of DCE in assigning a csPCa assessment in PZ lesions were calculated.
Results
A total of 271 men with mean age of 59 ± 6 years mean PSA 6.7 ng/mL were included. csPCa was found in 212/271 (78.2%) cases at pathology, 209 of which were localized in the PZ. DCE was necessary to further classify (45/209) of patients who received a score of DWI3. DCE was positive in 29/45 cases, increasing the final PI-RADS v2 assessment category to a category 4, with 16/45 having a negative DCE. When compared with final pathology, DCE was correct in increasing the assessment category in 68.9% ± 7% (31/45) of DWI3 cases.
Conclusion
DCE increases the accuracy of detection of csPCa in the majority of PZ lesions that receive an equivocal PI-RADS v2 assessment category using DWI.
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Grant funding provided by U01CA151261 (FMF), P41 EB015898 (CT, FMF) and DPH403516 (FMF, CT) and R25CA89017 (FMF, AZ).
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Mehdi Taghipour declares he has no conflicts of interest. Alireza Ziaei declares he has no conflicts of interest. Elmira Hassanzadeh declares he has no conflicts of interest. Francesco Alessandrino declares he has no conflicts of interest. Mukesh Harisinghani, declares he has no conflicts of interest. Mark Vangel declares he has no conflicts of interest. Clare M Tempany received the grant NIH P41 EB015898 from the National Institute of Health – National Cancer Institute, and the grant DPH 403516 from the Massachusetts Department of Public Health. Fiona M Fennessy received the grants from the National Institute of Health – National Cancer Institute: U01 CA151261; R25 CA089017.
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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.
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Taghipour, M., Ziaei, A., Alessandrino, F. et al. Investigating the role of DCE-MRI, over T2 and DWI, in accurate PI-RADS v2 assessment of clinically significant peripheral zone prostate lesions as defined at radical prostatectomy. Abdom Radiol 44, 1520–1527 (2019). https://doi.org/10.1007/s00261-018-1807-6
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DOI: https://doi.org/10.1007/s00261-018-1807-6