[A case of retrocaval ureter treated in childhood]

A case of retrocaval ureter in a 10-year-old boy is reported. His chief complaint was asymptomatic total macrohematuria. Physical examination and all laboratory findings were within normal limits, but drip infusion pyelography revealed a right hydronephrosis with "S shaped" ureter. The diagnosis was confirmed by enhanced CT scan. After follow-up for 1 year and a half, right uretero -ureterostomy was performed because the severity of the hydronephrosis had increased. We review 25 cases of retrocaval ureter in childhood reported in the Japanese literature and compare the clinical characteristics between infant cases and adult cases.