Clinical course of patients with upper urinary tract stones in the renal calyx and/or renal pelvis with size equal to or more than 10 mm in maximum diameter on conservative therapy―Data from the epidemiological survey in 2015 by Nara Urological Research and Treatment Group, Section of Urolithiasis―

Eijiro Okajima; Takuto Shimizu; Kota Iida; Kenta Onishi; Masaki Haramoto; Syuya Hirao; Yoshiaki Matsumura; Yoshinori Nakagawa; Nobumichi Tanaka; Kiyohide Fujimoto

doi:10.11302/jsejje.33.75

Eijiro Okajima, Takuto Shimizu, Kota Iida, Kenta Onishi, Masaki Haramoto, Syuya Hirao, Yoshiaki Matsumura, Yoshinori Nakagawa, Nobumichi Tanaka, Kiyohide Fujimoto

Author information

Eijiro Okajima
Section of Urolithiasis, Nara Urological Research and Treatment Group
Department of Urology, Nara City Hospital
Takuto Shimizu
Section of Urolithiasis, Nara Urological Research and Treatment Group
Department of Urology, Saiseikai Chuwa Hospital
Kota Iida
Section of Urolithiasis, Nara Urological Research and Treatment Group
Department of Urology, Yamatotakada Municipal Hospital
Kenta Onishi
Section of Urolithiasis, Nara Urological Research and Treatment Group
Department of Urology, Takai Hospital
Masaki Haramoto
Section of Urolithiasis, Nara Urological Research and Treatment Group
Department of Urology, Takai Hospital
Syuya Hirao
Section of Urolithiasis, Nara Urological Research and Treatment Group
Department of Urology, Hirao Hospital
Yoshiaki Matsumura
Section of Urolithiasis, Nara Urological Research and Treatment Group
Department of Urology, Nara General Medical Center
Yoshinori Nakagawa
Section of Urolithiasis, Nara Urological Research and Treatment Group
Department of Urology, Yamatotakada Municipal Hospital
Nobumichi Tanaka
Section of Urolithiasis, Nara Urological Research and Treatment Group
Department of Urology, Nara Medical University
Kiyohide Fujimoto
Section of Urolithiasis, Nara Urological Research and Treatment Group
Department of Urology, Nara Medical University

Keywords: kidney stone, clinical course, conservative therapy

JOURNAL FREE ACCESS

2020 Volume 33 Issue 1 Pages 75-78

DOI https://doi.org/10.11302/jsejje.33.75

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Abstract

To clarify the clinical course of relatively large renal stones treated by conservative therapy, we evaluated renal units (RUs) of patients with upper urinary tract stones who visited the institutions of Nara Urological Research and Treatment Group. We defined patients who were stone-free as no active stone ≧4 mm in maximum diameter and evaluated the stone-free rate (SFR) as the primary endpoint. We examined 38 RUs with stone (s) ≧10 mm in diameter of the renal pelvis or calyxes without any ureteral stone (s), and treated them with conservative therapy. The estimated SFR at 2 years is 20.8% by Kaplan – Meier’s survival curve method. As the RUs lost to follow-up had reached 50%, it is imperative to improve the method adopted for giving out information regarding future risks and to place emphasis on the importance of follow-up for relatively large, but silent, kidney stones while not missing the timing of treatment to avoid renal damage.

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