Has anyone ever had them? I found out 2/2011 I had one stone the size of a quarter and was too big to pass. Talk about pain and getting knocked on your ass! Had two Lythotripsy procedures done in 2011 and nothing happened. Finally 2/2012 the stone now stones left my kidney and are now stuck in my ureter. Just had a ureter stent put in 4/27/2012 and have to keep it in for 2 weeks. Then go back to surgery to have it removed and get a laser treatment to break up the stones then pass. Now I have blood in my urine and go to the bathroom every 5 to 10 minutes to pee. I think I went about 70 times yesterday! Anyway I'm in hell right now and can't wait till its over. Can't wait to find out what they are made of and change my diet!