A thin endoscope is passed through the urethra, into the bladder, then up the ureter until the stone is seen. If it is small, a basket can be passed through the ureteroscope to retrieve the stone. If the stone is large, a laser fiber can be passed that will pulverize the stone into smaller pieces that can pass or be retrieved. A ureteral stent is often placed after the procedure (small tube interposed between the kidney and ureter) to ensure proper drainage. The stent is removed after several days.