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Updated: Jun 30, 2026

Evaluation of Biomaterials for Bladder Augmentation using Cystometric Analyses in Various Rodent Models
Published on: August 9, 2012
A Case of Giant Neobladder Stone of 5 Kg
Kaede Hiruma1, Masayuki Tasaki1, Tsutomu Anraku1
1Division of Urology, Department of Urology Niigata University Graduate School of Medical and Dental Sciences Niigata Japan.
Introduction:
Radical cystectomy is the standard treatment for muscle-invasive bladder cancer. A neobladder is created as part of urinary diversion; however, the formation of bladder stones is often a late complication-related concern.
Case Presentation:
A 56-year-old man underwent radical cystectomy and neobladder construction for bladder cancer 25 years ago. A huge neobladder stone was diagnosed when the patient developed a strangulated ileus. Open surgery was performed to remove the bladder stone. The stone's size was 21.6 × 15.5 × 18.5 cm and its weight was 5 kg.
Conclusion:
To the authors' knowledge, this is the largest case of bladder calculus reported to date.
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