The author, because of an unusually large experience with a relatively rare condition, has had an opportunity to consider all methods of management. He correctly emphasizes the importance of the combined venacavogram and retrograde pyelogram in clinching absolutely the diagnosis . Particularly interesting is the case of a unique periureteral venous ring that was formed by the persistence of the right posterior cardinal vein along with the normal vena cava. This may be a unique experience.
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