Dilated ureter presenting as a cystic abdominal mass--a case report.

A seven-month-old female child presenting with a large abdominal mass was found on investigation to have a duplex right kidney with a non-functioning obstructed upper moiety and a right ureterocele. The grossly dilated and tortuous upper moiety ureter presented as a large cystic mass on ultrasound and computed tomographic scans.