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. 2025 Apr 9;8(3):281-284.
doi: 10.1002/iju5.70026. eCollection 2025 May.

A Case of Giant Neobladder Stone of 5 Kg

Kaede Hiruma  1 , Masayuki Tasaki  1 , Tsutomu Anraku  1 , Masahiro Ikeda  1 , Kazuhide Saito  1 , Yoshifumi Shimada  2 , Yoshihiko Tomita  1
Affiliations

A Case of Giant Neobladder Stone of 5 Kg

Kaede Hiruma et al. IJU Case Rep. .

Abstract

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.

Keywords: bladder cancer; bladder stones; cystectomy; neobladder stone; urinary stone.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

FIGURE 1
FIGURE 1
Neobladder stone in this case. (A) Abdominal X‐ray image. (B) Sagittal view of plain CT scans. (C, D) The removed stone.
FIGURE 2
FIGURE 2
Intraoperative photographs. (A) There is a scar from a midline incision on the lower abdomen. (B–D) A longitudinal incision was made in the expanded neobladder, and the stone was removed. (E) The balloon of the indwelling catheter could be seen inside the new bladder (*). (F) After administering ICG intravenously and irradiating it with NIR light, the areas with blood flow glowed green.
FIGURE 3
FIGURE 3
Mechanism of the formation of neobladder stones.
See this image and copyright information in PMC

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