Concerned but no symptoms

Been told I have  a very smalll 'outpouching' in my bladder. Suffered from a UTI in the summer, but have no symptoms of anything since then. Gp booked me in for an ultrasound to be on the safe side I imagine. That's what showed up this very small mass. Sonographer said it could be my normal physiology, but can't 100per cent rule out the possibility of cancer. I've been given an urgent referral to urology.

What kind of tests am I likely to be given? I feel as fit as a fiddle, and with no symptoms at all, I really don't want to go through invasive procedures if they are unnecessary.