Endourology & Stone Disease(구연) (E-173) 복부골반단층촬영술 시행시 조영제의 사용이 결석배출에 미치는 영향 충북대학교 의과대학 비뇨의학교실 이희윤, 김경, 서성필, 강호원, 김원태, 김용준, 윤석중, 이상철, 김원재 PURPOSE Computed tomography (CT) scan is the gold-standard imaging investigation of choice for the initial assessment of patients with suspected urolithiasis. We investigate whether the use of contrast media during CT scan would affect the rate of spontaneous stone passage and the time to passage in patients with ureter stones. PATIENTS AND METHODS We retrospectively reviewed the medical records of patients who had ureteric stones of < 10 mm and who were treated conservatively at our stone clinic during the period 1997 and 2017. The spontaneous passage rate and time, and different clinical, laboratory and radiological variables, were compared according to the use of contrast media during CT scan. RESULTS Data from 1,829 patients were reviewed (1,468[80.3%] with contrast CT, 361 [19.7%] with non-contrast CT). There was no significant difference in terms of mean age, BMI distribution, and gender differences, glomerular filtration rate, and stone location and maximum stone diameter between contrast CT and non-contrast CT group. The rate of spontaneous stone passage between contrast CT and non-contrast CT group was not significant. In comparison with non-contrast CT group, patients with contrast CT had a longer time to passage of ureter stone. CONCLUSIONS This finding implies that the use of contrast media during computed tomography scan may delay the spontaneous stone passage of ureteral stones. It is preferable to avoid the use of contrast media administration in the workup of patients with suspected urolithiasis, unless it is truly necessary, keywords : Contrast media, Ureteral stone, Computed tomography