<s>[INST] I had a lithotripsy done late last year on an 8mil kidney stone.....the Dr did not place a stent in after the procedure and as a result I had blockage in my uretor that was VERY painful.  As a result I had too be admitted into a hospital and have another procedure to place the stent in.   Shouldnt a stent have been put in before the lithotripsy? [/INST] HiWe usually do not routinely place a stent in patients undergoing lithotripsy for a stone less than 10mm. I think your doctor is justified in going ahead with the procedure. If your stone was hard,, the resultant fragments might have been large enough to cause obstruction which is the reason you now need to have stent placed </s>