CRP and urinary tract infection: The intensity of the UIS in non-treated Cys-patients was not associated with CRP, blood leukocytes, the presence of calculi, recent urinary tract infections, urological interventions or spontaneous calculi expulsions, suggesting that this UIS may be linked to an intrarenal inflammatory process, as suggested by the higher prevalence of leukocyturia in patients with a strong UIS, rather than to systemic or urological inflammatory processes.