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Answer 4
  1. Ureterovesical junction. Stones can be found in all the areas listed, but the ureterovesical junction is the most common site of impaction because of its smaller diameter compared with the other 4 locations listed. For a stone to become impacted, it must have at least one diameter that is 2 mm or greater. Stones can also be impacted at the ureteropelvic junction, at the bifurcation of the iliac vessels, and over the pelvic brim.

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