Three-dimensional mean stone density on non-contrast computed tomography can predict ureteroscopic lithotripsy outcome i
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ORIGINAL PAPER
Three‑dimensional mean stone density on non‑contrast computed tomography can predict ureteroscopic lithotripsy outcome in ureteral stone cases Shimpei Yamashita1 · Yuya Iwahashi1 · Ryusuke Deguchi1 · Kazuro Kikkawa1 · Yasuo Kohjimoto1 · Isao Hara1 Received: 28 July 2019 / Accepted: 13 January 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The association between mean stone density (MSD) and ureteroscopic lithotripsy outcome remains controversial. MSD automatically measured by 3D images of stones (3D-MSD) was recently reported to be more useful than manual measuring methods for predicting outcomes of shock-wave lithotripsy. This study aims to investigate whether 3D-MSD can predict ureteroscopic lithotripsy outcome. We retrospectively identified 218 patients who underwent ureteroscopic lithotripsy for kidney stones (n = 135) and ureteral stones (n = 83) between February 2011 and April 2017 with pretreatment non-contrast computed tomography (NCCT) at our hospital. Stone volume and 3D-MSD were automatically measured using high functional viewer. Logistic regression analysis was performed to identify factors contributing to treatment failure. Treatment failure was determined as residual fragments ≥ 4 mm using NCCT within 3 months after operation. Treatment failure rate was 20.1% (44/218 cases). Patients in treatment failure group had higher percentage of kidney stones (
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