Finding the right tests…
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Finding the right tests…
MRI
A prostate MRI looks closely at the prostate gland before a biopsy is done, or to help decide if a biopsy is needed at all. Doctors score what they see using PI-RADS, a five-point scale where a higher score means a suspicious area is more likely to be cancer. Research comparing biopsy methods found that combining an MRI-targeted biopsy with a standard biopsy missed far fewer cancers than either approach used alone, and also reduced the number of benign, unnecessary biopsies that were common when biopsies were taken blind, without knowing exactly where to sample. If your prostate MRI finds a suspicious area, your doctor may use it to guide the biopsy needle directly to that spot.
The scan combines several MRI techniques to look at the prostate's shape, tissue characteristics, and blood flow patterns. Findings are usually reported using the PI-RADS scale, from 1 (very low suspicion) to 5 (very high suspicion), which your doctor uses to decide on biopsy or monitoring.
Prostate biopsies used to be done without knowing exactly where in the gland a cancer might be, sampling multiple areas somewhat blindly. MRI changed that by showing suspicious areas ahead of time, so a biopsy can be targeted rather than a guess.
- Radiologists rate suspicious areas from 1 to 5 under the PI-RADS system - A score of 3 or higher usually leads to a recommendation for biopsy of that area - Lower scores may support avoiding a biopsy altogether, sparing men a procedure they may not need
A large study comparing biopsy approaches found that combining MRI-targeted biopsy with standard systematic biopsy missed only about 14% of cancers, compared with about 40% missed by systematic biopsy alone and about 30% missed by MRI-targeted biopsy alone. The combined approach also found more aggressive cancers that a systematic-only biopsy would have missed, while cutting down the number of biopsies that came back benign.
If your MRI shows a suspicious area, your doctor may recommend an MRI-targeted biopsy, sometimes combined with a standard biopsy, to sample that specific spot. If nothing suspicious is seen, your doctor may recommend monitoring instead of an immediate biopsy, depending on your overall risk.
Not always, but it's increasingly used before a first biopsy because it can show doctors where to target the sample and can help avoid unnecessary biopsies. Your doctor will decide based on your PSA levels and overall risk.
It's a 1-to-5 scale radiologists use to describe how suspicious an area of the prostate looks, with 5 being the most concerning. Your doctor uses this score, along with your other results, to decide on next steps.
In some cases, yes. If nothing suspicious is seen on the MRI, your doctor may recommend monitoring instead of an immediate biopsy, depending on your risk factors.
No. It uses magnetic fields and radio waves, not X-rays.
This page is general information about the test, not medical advice. Your own report's reference ranges apply — please discuss your results with your doctor.
Many prostate MRI protocols include a contrast injection as part of a multiparametric exam. Ask your doctor or the centre what your specific scan involves.
Preparation instructions can vary by centre. Ask your doctor or the centre for specific guidance before your appointment.
Your doctor will likely recommend a targeted biopsy of that specific area. This is sometimes combined with a standard biopsy to get a tissue sample for diagnosis.