Urinary tract stones that cause acute flank pain are diagnosed using noncontrast computed tomography (CT) with a high sensitivity (95-98%) and specificity (96-100%). CT has an advantage of detecting urinary and extraurinary pathologies, including appendicitis, mesenteric lymphadenitis, epiploic appendagitis, sclerosing mesenteritis, acute cholecystitis, spondylolysis, retro aortic left renal vein, pelvic congestion syndrome, and pneumonia, which cause flank pain. We present the incidental abdominal CT findings of patients who had undergone noncontrast CT with the symptoms of flank pain mimicking renal colic without any findings of urolithiasis upon imaging.
Keywords: Renal stone, computed tomography, flank pain