Altered biodistribution of Ga-67 by intramuscular gold salts.

The authors observed a deviation from the normal scintigraphic pattern of Ga-67 citrate biodistribution. An 8-year-old black girl with juvenile rheumatoid arthritis, who had been treated with intramuscular injections of gold salts, had a Ga-67 study as part of her workup. The study demonstrated no hepatic uptake, but showed elevated skeletal and renal activity. This characteristic biodistribution of Ga-67 may be due to inhibition of lysosomal enzymes by gold and/or to accumulation of gold in lysosomes. To study these possibilities, the authors reviewed the mechanisms of Ga-67 localization and gold metabolism. Alteration of the Ga-67 citrate scintigraphic pattern due to earlier treatment with gold salts has not been reported previously.