Plain radiograph Calcium-containing stones are radiopaque: Calcium oxalate +/- calcium phosphate Struvite (triple phosphate) - usually opaque, but variable Pure calcium phosphate Lucent stones include: Uric acid Cystine Medication (indinavir is best known) stones Pure matrix stones (although may have a radiodense rim or centre) Key Point: Cysteine and Cystine are different amino acids.
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