Familial Xanthinuria in a Large Kindred: Purine Metabolites in Plasma and Urine of Xanthinurics, Siblings and Normal Subjects

Genetics of Urolithiasis

“…Xanthine may represent 78% -80% of total urinary oxypurine in patients with xanthinuria [114]. Xanthine calculi are generally radiolucent; however, some xanthine stones contain sufficient calcium to become slightly opaque.…”