# A Case of Giant Neobladder Stone of 5 Kg

## TL;DR

A 56-year-old man had a 5 kg bladder stone removed 25 years after bladder cancer surgery, the largest such case reported.

## Contribution

Reports the largest documented bladder stone following neobladder construction.

## Key findings

- A 5 kg neobladder stone was successfully removed via open surgery.
- The stone was identified during a complication of strangulated ileus.
- This case highlights the long-term risk of bladder stones after cystectomy.

## Abstract

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.

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.

To the authors' knowledge, this is the largest case of bladder calculus reported to date.