A sixteen day old infant developed candiduria after surgery on a single functioning, hydronephrotic kidney with ureteropelvic junction stenosis. Masses of candida albicans caused obstruction of the ureter with acute anuria. Endoscopic relief of the obstruction together with aggressive antifungal therapy led to irradication of the fungal infection. This case history emphasizes the fact that candida infection in early childhood should be evaluated carefully. Unfortunately no guidelines are yet available for the indications and the preferred mode of treatment, and length of therapy of infantile renal candidiasis.