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APPLICATION OF THE S.T.O.N.E SCORE ON MULTI-SLICE COMPUTED TOMOGRAPHY IN THE EVALUATION OF KIDNEY STONES BEFORE LITHOTRIPSY
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Abstract
Purposes: The aims of this study was to apply the S.T.O.N.E score on multi-slice computed tomography to evaluate the complexity of kidney stones before lithotripsy. Material and methods: Descriptive study on 71 patients with kidney stones, who underwent multi-slice CT scanner of the urinary system followed by lithotripsy at Hanoi Medical University Hospital from July 2022 to July 2023. The imaging characteristics of kidney stones on non-contrast CT scanner were classified according to the S.T.O.N.E scale to assess the complexity of the stone before lithotripsy. Results: The mean age was 53.8±12.3, the lowest age was 31 years old, the highest age was 73 years old. Male/female ratio was 1.54. According to S.T.O.N.E scale, in terms of stone size (S), the number of patients with stone area <400 mm2, from 400 to 799 mm2, from 800 to 1599 mm2 and ≥ 1600 mm2 were 21 (accounting for 29.6%), 30 (accounting for 42.3%), 14 (accounting for 19.7%) and 6 (accounting for 8.5%), respectively. Regarding tract length (T: calculated from the center of stone to the skin surface), the number of patients with tract length <100 mm and >100 mm was 62 (accounting for 87.3%) and 9 (accounting for 12.7%), respectively. Regarding the degree of obstruction (O), the number of patients with no or mild hydronephrosis was 46 (accounting for 64.8%), with moderate or severe dilation was 25 (accounting for 35.2%). Regarding the number of involved calices (N), the number of patients with coral stones, calyces combined with renal pelvis, single calyces or simple renal pelvis stones were 10 (accounting for 14.1%), 37 (accounting for 52.1%) and 15 (accounting for 21.1%), respectively. Regarding stone density (Essence of stone density), the number of patients with stone density <950 HU and ≥ 950 HU were 9 (accounting for 12.7%) and 62 (accounting for 87,3%) respectively. Conclusion: The S.T.O.N.E score was a simple, easy quantitative tool to evaluate the complexity of kidney stones before lithotripsy
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Keywords
STONE score CT scan, lithotripsy, kidney stones
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