Here and there we find people who make uncommon crystals and require very special care. Uric acid, as an example, can form odd crystals such sodium or ammonium acid urate, especially in people with bowel disease and chronic diarrhea.
Anti-viral drugs can crystallize in urine and form stones only recognized for what they are through stone analysis. Very rare disorders of metabolism can produce molecules which crystallize in the urine, for example 2-8 dihydroxyadenine.
Although it can take a while before the right answer emerges, stone analyses will put physicians on the right track for these special cases.
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