Prostate MRI
Learn more about how prostate MRIs work in conjunction with PI-RADS to help you manage your cancer.
2 Minute ReadWhat is a prostate MRI?
A prostate MRI has transformed the way prostate cancer is diagnosed and managed — and it may be one of the most important tools in your care. Using high-resolution imaging, an MRI can detect cancerous changes in the prostate even in the early stages, giving your care team a detailed picture that guides every step of what comes next.
This information helps your doctors pinpoint areas of concern for a targeted biopsy, identify whether significant cancer is present, and — if cancer is found — determine the best treatment options for your specific situation. The earlier and more precisely cancer is detected, the more options you have.
PI-RADS Scoring System
| PI-RADS Score | Risk Level | What It Means |
|---|---|---|
| PI-RADS 1 | Very low | Clinically significant cancer highly unlikely |
| PI-RADS 2 | Low | Clinically significant cancer unlikely |
| PI-RADS 3 | Intermediate | Clinically significant cancer possible (10-20% chance) |
| PI-RADS 4 | High | Clinically significant cancer likely (30-50% chance) |
| PI-RADS 5 | Very High | Clinically significant cancer highly likely |
When your prostate MRI is reviewed, your radiologist will assign it a PI-RADS score — short for Prostate Imaging-Reporting and Data System. This score tells you and your doctor how likely it is that a clinically significant cancer is present.
A higher PI-RADS score is also associated with a greater likelihood of Gleason 7 or above cancer — the kind that tends to be more aggressive and may require treatment. A lower score, on the other hand, suggests a lower risk of encountering that type of cancer. While no imaging test is perfect, combining MRI with PI-RADS scoring has significantly improved how accurately prostate cancer can be diagnosed and managed.
Gleason Grade Group System
| Grade Group | Gleason Score | What It Means |
|---|---|---|
| Grade Group 1 | 3+3=6 | Low risk, less aggressive |
| Grade Group 2 | 3+4=7 | Intermediate risk, more favorable |
| Grade Group 3 | 4+3=7 | Intermediate risk, more favorable |
| Grade Group 4 | 4+4=8 | High risk, more aggressive |
| Grade Group 5 | 9-10 | Very high risk, more aggressive |
Your PI-RADS score is often considered alongside your Gleason Grade Group, which describes how aggressive the cancer cells appear under a microscope.
Together, your MRI findings, PI-RADS score, and Gleason Grade Group give your care team a comprehensive understanding of your cancer — not just whether it’s there, but where it is, how it behaves, and how best to treat it. This combination of advanced technology and precise classification is what allows your team to deliver truly personalized care.