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Renal Excretion of Radioiodinated Rose Bengal—A Pitfall in the Interpretation of Rose Bengal Abdominal Scans

Albert Einstein College of Medicine, Bronx, New York

ABSTRACT

Extrahepatic biliary-tract obstruction as well as severe intrahepatic disease causes increased renal excretion of radioiodinated rose bengal. Experimental evidence indicates that there is continual dissociation of ¹³¹I from rose bengal in vivo and indirectly suggests that a good portion of this urinary excretion may be in the form of free ¹³¹I.

The importance of recognizing renal activity on rose bengal abdominal scans lies in the need to differentiate it from intestinal activity and to avoid an erroneous impression of a patent biliary tract where obstruction actually exists.