There are multiple ways to look for the presence of kidney stones on ultrasound. Kidney stones may be located within the renal parenchyma, at the ureteropelvic junction (between the ureter and the renal pelvis), within the ureter, or at the ureterovesical junction (between the ureter and the bladder). Ureteral Stone Size and Spontaneous Passage Rate (Adapted from Jendeberg 2010) Kidney Stone Location See the table below for spontaneous passage rates for specific ureteral stone sizes. Stones 5mm will have an exponentially lower chance (9-65%) of spontaneously passing (Jendeberg 2010). The cutoff size for a significant kidney stone size is around 5mm.
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