In my case the DRE from the Uro was a lot more intense and thorough than the one from my PCP who "thought there might me some firmness". The Uro got in there and really poked around. So much so, that at one point I squirted on the table. He identified all kinds of things before the biopsy and knew where to punch when he did it. (He also found my 2008 pocket notebook that I misplaced the previous year.
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It is worth going to an expert.
Jeff