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MRI Results – What the scores mean
Overview by Dr Francesco Giganti
Associate Professor and Honorary Consultant in Radiology
Faculty of Medical Sciences
University College London
The Prostate Imaging-Reporting and Data System (PI-RADS) score is a dedicated scoring system that is used to evaluate the likelihood of harbouring clinically significant prostate cancer on multiparametric magnetic resonance imaging (mpMRI).
It is built on a 1-to-5 scale where a score of 1 or 2 indicates that the presence of clinically significant disease is (highly) unlikely while a score of 4 or 5 means that it is (highly) likely and a biopsy should be performed. A score of 3 entails that the MR findings are equivocal.
The full PI-RADS document (latest version, v. 2.1) can be viewed here:
One of the most important aspects of this document is the sector map shown on page 31. This map should be always included along with the MR structured report in order to indicate the accurate location of the lesion(s) for biopsy or treatment planning.
The anterior fibromuscular stroma, seminal vesicles and external urethral sphincter are also represented in the diagram.
Prostate MRI can be also reported using another 1-to-5 scale (called Likert scale), which reflects the likelihood of the presence of prostate cancer similarly to the PI-RADS score. The difference between the two scoring systems is that the Likert scale is more subjective and is based on the experience of the radiologist reporting the scan, taking into considerations other parameters such as PSA or the prostate background on imaging.
A comparison between the two scoring systems can be found here:
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