Table 1.
Stone composition | Frequency | Comment |
---|---|---|
Calcium | 80% | Radio-opaque |
Struvite stones | 5–15% | Associated with infection |
Uric acid | 5–10% | Radiolucent |
Cystine | 1–2.5% | |
Ammonium urate | 0.5–1% | |
Others: xanthine, protein matrix 2,8-dihydroxyadenine drugs, e.g. indinavir, triamterene | Rare |