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Fig. 6. —32-year-old man with ureterolithiasis who presented with right-sided flank pain. CT scan reveals tiny stone (arrow) at level of right ureterovesical junction. No indirect CT sign of ureteral colic was present. Sonography and unenhanced radiography (not shown) failed to detect any sign diagnostic for ureteral colic. A 1-mm calculus was spontaneously passed 10 min after CT study and found in urine.