I recently went in for surgery to remove a large mass (6cm by 8cm) from inside of my bladder. They were able to get out 90% of it. Pathology determined it to be a leiomyoma tumor, which he says is benign. My Dr. has never seen one of these before, and says he's not sure how to treat it. My question is, is that since they couldn't remove it completely, will it grow back? Also, what are the chances of it becoming cancerous in the future? I'm not scheduled for another CT Scan until October, and my curiosity (worrying) can't wait that long. Please help! Thank you, Bob