I want to double down on the value of a ‘fusion guided’ MRI. That uses prior MRI data and active ultrasound. My home town urologist wanted to do an ultrasound guided biopsy in his office. I don’t know if fusion guided biopsy was an option in our local hospital, then.
I suspect that urologists (read surgeons) are less concerned about a comprehensive biopsy because they do RP (Radical Prostatectomy). If however, one considers radiation (traditional/photon or PBT (proton beam treatment) knowing exactly where there is cancer in the prostate will help to guide the treatment.
Your original question about the likelihood of the lesion being cancerous has a lot to do with your age, history of your PSA, and family history.
In my case I had no family history of prostate cancer, but my PSA had been rising about 1.0 every year. I was 69 when diagnosed. You also didn’t mention if your MRI was an mpMRI (multi-parametric MRI). mpMRI is the ‘gold standard’ for prostate cancer diagnosis.

Wanting to know is understandable. But I’ll caution you to use the delay to research the various types of treatments for prostate cancer. Take a look at the videos at the prostate cancer research institute pcri.org .
You need to be bold and your own advocate (hopefully with a helpful friend/partner).

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