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False Positive Brain Scans From Extracranial Contamination with ^99mTechnetium¹

Winston-Salem, No. Carolina

ABSTRACT

Four cases of extracranial ^99mTc contamination are discussed. Three resulted after oral and one after intravenous administration. Similar artefacts have been intentionally produced by placing saliva on patient's heads. There would appear to be a greater possibility of a false-positive scan with the oral dose, however, due to concentration by the salivary glands and gastric mucosa, it cannot always be circumvented with the intravenous technique.

FOOTNOTES

¹ Partially supported by NIH Grant No. CRT-5069.

² Department of Radiology, Bowman Gray School of Medicine, Winston-Salem, N. C.

³ Trainee of the American Cancer Society