Hi Dennis and welcome to Healing Well. Sorry you have to be here but I'm sure you will find lots of support and advice here. Here is a quick link to a simple summary of the multi parametric MRI.
www.jenkinsclinic.org/procedures/multiparametric-mri/This is a fairly new procedure and not offered everywhere but many doctors with expertise in prostate cancer now feel this test is essential to proper staging and treatment of our disease.
Re the PSA calculation you did - your math is right but the 17.4 volume for your prostate would be quite small. Your report should absolutely indicate the total prostate size; if not, you should be able to get that info from your physician. In any case, the point is that you have a lot of "unexplained" PSA that needs to be tracked down.
BTW, I know that when you arrive at a forum such as this you don't know Adam from Eve re who knows what they are talking about
. You are fortunate enough to have gotten some great insight on your thread from JohnT who, while not a physician, has studied our disease for many years and I consider him highly qualified to give you pointers about
where to go in your journey for answers.
Best of luck as you proceed,
Jim