The diagnosis of unilateral renal vein thrombosis was established in a 50-year-old woman. A functional evaluation, by means of Tc-99m DTPA, was performed almost immediately, and at intervals up to nearly eight months later. Functional return of the involved kidney could be documented by plotting the ratio of affected kidneysol;total kidney activity. Conservative therapy was accompanied by a return of function of the kidney to 45percnt; of total renal activity.
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