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Sonography in the demonstration of hydroureter and associated hydronephrotic renal moiety.

Duplex renal collecting systems are discovered in 3–4% of patients subjected to intravenous urography (Bailey and Love, 1959). In cases of complete duplication of the ureter the lower ureteric orifice is frequently the site of some degree of congenital atresia resulting in hydroureter and hydronephrosis of the related moiety. According to the Weigert-Meyer law the lower and medial ureteric orifice belongs to the upper moiety of the duplex renal system. This report is of such an example diagnosed initially by sonography with subsequent radiographic confirmation achieved by ultrasonically guided antegrade pyelography. We have also seen one similar case in which the diagnosis was suggested by the ultrasound findings. This patient was symptom-free and did not wish to undergo confirmatory radiological tests.