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Updated: Jun 24, 2026

Estimation of Urinary Nanocrystals in Humans using Calcium Fluorophore Labeling and Nanoparticle Tracking Analysis
Published on: February 9, 2021
Clinical evaluation of urolithiasis in Crohn's disease
Genichi Ishii1, Kouichi Nakajima, Norie Tanaka
1Department of Urology, Toho University School of Medicine, Tokyo, Japan. gen-93013@sakura.med.toho-u.ac.jp
Objectives:
To investigate the characteristics of urolithiasis associated with Crohn's disease in a Japanese population.
Methods:
We studied 98 patients with Crohn's disease: 39 with urolithiasis and 59 without urolithiasis. Patients were treated at the Social Insurance Central General Hospital, or at the Toho University Omori, Ohashi, or Sakura Medical Centers.
Results:
Calculi were more frequent in men (n = 30) than women (n = 9). Mean time from diagnosis of Crohn's disease to diagnosis of calculi was 8.8 years (range 0 to 22 years). Calculi were present on the right side in 19 patients and the left side in 19 patients. Stone were composed of calcium oxalate in nine patients, calcium oxalate and calcium phosphate in two patients, and ammonium urate in five patients. The rate of concurrent calculi was significantly higher in ileostomates. The probability of developing calculi was approximately eight times higher for patients with a urine pH of
Conclusions:
The rate of concurrent urolithiasis was higher in patients with a urine pH of
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