I finally got up the courage to ring the hospital yesterday - outrage winning over the I-don't-wanna-know's. It's been three weeks since the MRI and even our GP hadn't heard anything. The MRI lab had to send the results thru to the surgery but the upshot is:
the tumor is consistent with the appearance of FNH (so therefore benign)
the size is 6.5 x 4.5 cmm
I still don't know if it requires surgical removal or anything, those doctors notes haven't been made available.