Xanthinuria, also known as xanthine oxidase deficiency.



X is a rare genetic disorder causing the accumulation of xanthine, due to a deficiency of the enzyme xanthine oxidase.



High concentrations of xanthine in blood and urine, can lead to renal failure and xanthine kidney stones.



X is one of the rarest types of kidney stones.



Xanthine oxidase is an enzyme necessary for converting xanthine to uric acid.



There is no specific treatment:  maintaining a high fluid intake and avoiding foods that are high in purine.



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