I would recommend a color doppler procedure to help find it. If you are not having BPH symptoms, your PC ( if there is any) could be in an area where the biopsy doesn't hit.
The other thing I would ask about is free PSA. This is another indicator.
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Age 58, PSA 4.47 Biopsy - 2/12 cores , Gleason 4 + 5 = 9
Da Vinci, Cleveland Clinic 4/14/09 Nerves spared, but carved up a little.
0/23 lymph nodes involved pT3a NO MX
Catheter and 2 stints in ureters for 2 weeks .
Neg Margins, bladder neck negative
Living the Good Life, cancer free 6 week PSA <.03
3 month PSA <.01 (different lab)
5 month PSA <.03 (undetectable)
6 Month PSA <.01
1 pad a day, no progress on ED. Trimix injection
No pads, 1/1/10, 9 month PSA < .01
1 year psa (364 days) .01