Sadly, yes. I met with an interventional radiologist, at the recommendation of my urologist and hematologist, in the hope that he can help. Current theory is/was that there's an AVM (arteriovenous malformation) causing the bleeding but none have been seen on the CTs I've had done. I'm going to have a CTA (CT angiogram) to see if they can spot the problem. Then hopefully fix it. The radiologist didn't seem optimistic though. I hope he's wrong.