Sub-differentiating equivocal PI-RADS-3 lesions in multiparametric magnetic resonance imaging of the prostate to improve cancer detection. Issue 95 (October 2017)

• Record Type: Journal Article
• Authors: Hansen, N.L.; Koo, B.C.; Warren, A.Y.; Kastner, C.; Barrett, T.
• Is Part Of: European journal of radiology. Issue 95(2017)
• Page Start: 307
• Page End: 313
• Publication Date: 2017-10
• Subjects: mpMRI multiparametric magnetic resonance imaging -- PI-RADS Prostate Imaging-Reporting and Data System -- NPV negative predictive value -- PPV positive predictive value -- US Uultrasound -- T2WI T2-weighted imaging -- DWI diffusion-weighted imaging -- ADC apparent diffusion coefficient -- PSA prostate specific antigen -- GS Gleason score -- PZ peripheral zone -- TZ transition zone; Prostate -- MRI -- PIRADS -- Indeterminate; Medical radiology -- Periodicals; Radiology -- Periodicals; Radiologie médicale -- Périodiques; Medical radiology; Periodicals; 616.075705
• DOI: 10.1016/j.ejrad.2017.08.017
• Languages: English
• ISSNs: 0720-048X

Abstract

Highlights: Objective T2WI and DWI helped improve cancer yield for equivocal (PI-RADS 3) lesions. Biopsy recommendation improved PPV to 32% for GS 7–10 and 61% for any cancer. No-biopsy recommended had equivalent NPV to a negative MRI (PI-RADS 1–2) at 92%. The criteria-based score system could potentially avoid 48% of biopsies in the cohort. Abstract: Purpose: To evaluate sub-differentiation of PI-RADS-3 prostate lesions using pre-defined T2- and diffusion-weighted (DWI) MRI criteria, to aid the biopsy decision process. Methods: 143 patients with PIRADS-3 index lesions on MRI underwent targeted transperineal-MR/US fusion biopsy. Radiologists with 2 and 7-years experience performed blinded retrospective second-reads using set criteria and assigned biopsy recommendations. Inter-reader agreement, Gleason score (GS), positive (PPV) predictive values (±95% confidence intervals) were calculated and compared by Fisher's exact test with Bonferroni-Hom correction. Results: 43% (61/143) patients had GS 6–10 and 21% (30/143) GS ≥ 3 + 4 cancer. For peripheral zone lesions, significant differences in any cancer detection were found for shape (0.26 ± 0.13 geographical vs. 0.69 ± 0.23 rounded; p = 0.0055) and ADC (mild 0.21 ± 0.12 vs marked 0.81 ± 0.19; p = 0.0001). For transition zone, significantly increased cancer detection was shown for location (anterior 0.63 ± 0.15 vs. mid/posterior 0.31 ± 0.14; p = 0.0048), border (pseudo-capsule 0.32 ± 0.14 vs. ill-defined 0.61 ± 0.15; p = 0.0092), and ADC (mild 0.35 ± 0.12 vs marked restriction 0.68 ± 0.17; p = 0.0057). Biopsy recommendations had 62% inter-reader agreement (89/143). Experienced reader PPVs were significantly higher for any cancer with "biopsy-recommended" 0.61 ± 0.11 vs. "no biopsy" 0.21 ± 0.10 (p = 0.0001), and for GS 7–10 cancers: 0.32 ± 0.10 vs. 0.08 ± 0.07, respectively (p = 0.0003). Conclusion: Identification of certain objective imaging criteria as well as a subjective biopsy recommendation from an experienced radiologist can help to increase the predictive value of equivocal prostate lesions and inform the decision making process of whether or not to biopsy.