Incidental Extraprostatic Findings in Multiparametric Prostate MRI: A Retrospective Evaluation from a Tertiary Care Center

Abstract

Objective: Prostate cancer is a significant health problem in men worldwide. Multiparametric magnetic resonance imaging of the prostate (mpMRI) is a diagnostic tool used in the management of men with suspected prostate cancer. This modality provides valuable information regarding extraprostatic tissues and the prostate gland. This study aimed to identify incidental extraprostatic findings (IEPFs) in patients who underwent mpMRI.
Methods: Data from patients who underwent mpMRI at our institution between October 2021 and September 2022 were retrospectively reviewed. Two experienced radiologists assessed the mpMRI scan images and reported using the Prostate Imaging Reporting and Data System (PI-RADS) categories. The findings were categorized as either related or unrelated to the genitourinary system. The findings were categorized into three groups: mild, moderate, and severe. A comparative analysis was performed to determine the clinical relationship between the PI-RADS score and age. 
Results: A total of 1000 scans were reviewed. A total of 29.4 % (n=294) of the patients had IEPFs. Fifty-one (5.1%) of these findings were related to the genitourinary system of the patient. Categorization based on the severity of the findings revealed that 333 patients had mild, 20 had moderate, and 13 had severe IEPFs. Analysis revealed a statistically significant difference in the distribution of genitourinary and non-genitourinary findings across groups (p < 0.001).
Conclusion: As a diagnostic adjunct tool, mpMRI is not only valuable for aiding in the diagnosis of prostate cancer but also for the detection of IEPFs, the distribution of these findings differs significantly between genitourinary and non-genitourinary system, which may have important clinical implications.

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