Hi Mike, sorry to hear about your story so far.
There is a lot to learn in a short space of time whenever problems like this come up.
Some places do a biopsy first and then an MRI scan, which seems like putting the cart before the horse to me. But that's the way the NHS works.
It's by no means mandatory to have a biopsy after your scan, I am having my biopsy on Tuesday after MRI revealed anomalies in my prostate. They asked if I wanted to proceed with a biopsy and I said yes. It's not a risk free procedure, but then nothing is 100% safe. So I can't imagine why I would have said no.
But it is down to your choice, and knowing as much as you can will help in making these decisions. No one can do that for you, just advise you.
I'm in very early days and it still feels surreal and daunting to consider things I never thought I would have to.
I hope the MRI goes well and that if you need a biopsy you will think about it carefully.
This is a great site, but it does give you so much information and experience that it can overwhelm you at times. Ignorance is bliss they say, but in this instance I think it's more a case of knowledge is power.
Take care and stay strong.
Mick