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A 53-year-old patient with renal colic. a Non-contrast coronal reformatted image demonstrates mild left hydroureter without evidence of a radiopaque ureteral calculus. b Nephrographic phase coronal reformatted image demonstrates symmetric enhancement without an apparent cause for the left-sided hydroureter. c Excretory phase coronal reformatted image demonstrates a rounded filling defect in the proximal left ureter, which was later confirmed at pathology to be a matrix stone
