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1 From the Department of Radiology, Los Angeles County-University of Southern California Medical Center, Los Angeles, California
A group of young males was found to have ureteral displacement by means of intravenous urography, and because of pertinent clinical findings in some of the cases, retroperitoneal disease, usually a tumor mass, was strongly suspected. Thorough investigation of these patients failed to reveal any confirmatory evidence of retroperitoneal abnormalities.
Evidence is presented that such deviation can be produced by a nonpathologic cause, iliopsoas muscle "hypertrophy," and can be identical in roentgenographic appearance to ureteral displacement caused by tumor.
This normal anatomic variant should be recognized as a cause of ureteral deviation and considered in the differential diagnosis of suspected retroperitoneal disease.
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