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Crystalline urine in a boy with Lesch-Nyhan disease

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(A) Small white crystals deposited in urine. (B) Small crystals after centrifugal precipitation. (C) Photomicrograph (x200) of square columnar magnesium ammonium phosphate (struvite) crystal with strong refraction (black arrow). (Source: Li L, Qiao X, Liu F, et al. Description of the molecular and phenotypic spectrum of Lesch-Nyhan disease in eight Chinese patients. Front Genet 2022;13:868942. Creative Commons Attribution License [CC BY], https://creativecommons.org/licenses/by/4.0.)