Hi Jen,
When I was at your stage of diagnosis they flagged up an anomoly on my spine.
Subsequent tests and X-rays found it to be arthritis.
I think they are doing MRI scans first these days, but you won't really know whether or not the PCa is aggresive untill your OH has had the biopsy.
They then normally do a 'bone scan' where they inject you with a marker which gathers around bone mets prior to the scan, I don't know if your consultant has suggested further tests on the pelvis, such as X-rays or a bone scan?
Perhaps he is taking things a bit at a time, and awaiting the biopsy result before going further.
A couple of years ago I was a candidate for some new treatment not available at my local hospital, to justify the treatment and I had to be scaned to make sure I wasn't dying of anything else, so I had to have a head to toe examination and they found loads of things wrong with me, my right hip being better than my left, growths on my kidney, two types of cysts on my thyroid gland etc, but when the dust had settled the doctors decided that none of these things were worth worrying about, all part of the normal wear and tear associated with a 60 year old man who hasn't been looked after by one careful owner.
:)
Dave