Clonorcis sinensis eggs are associated with calcium carbonate gallbladder stones

- Calcium carbonate gallbladder stones account for a large proportion in adults.
- Microstructures and subtypes are observed and identified.
- C. sinensis eggs were observed adhering to calcium carbonate crystals.
- C. sinensis DNA was identified using RT-PCR.
- C. sinensis infection was probably a significant cause of calcium carbonate stones.