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A case of massive hydronephrosis secondary to a ureteral valve was discovered upon evaluation of mild trauma. The orderly diagnostic studies, including ultrasonography and antegrade pyelography, led to the correct diagnosis and appropriate therapy. Ultrasonography as a diagnostic tool in urology is discussed and characteristics of the 18 cases of ureteral valves reported to date are reviewed.
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Fried et al. (1978) studied this question.
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