1st of all 1cm kidney stone needs treatment. Usually eswl is Enough if the HU units are less than 1000 on CT Your 1st question, since there is a Ureteral stent already, you can go ahead with eswl or lithotripsy as you said. Generally, 3 sittings are advised without any problems. And no there is absolutely no problem if there s stent inside. Only thing is, patients may complain of pain especially when passing urine. And yes, it s better to wait for 3 weeks. Access and then go ahead with lithotripsy. Give some time for the patient and explain he need not worry. Hope this helps.