The unusual finding of a progressively increasing nephrogram during excretory urography developed in a patient with acute unilateral renal vein thrombosis. The appearance simulated the nephrogram seen with urinary tract obstruction. It is likely that contrast material accumulated in the tubules, collecting ducts, and interstitial tissues of the kidney. The pathophysiology is briefly discussed.
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Coel et al. (1971) studied this question.