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April 6, 1979

Discrepancies in Thyroid Scans

Author Affiliations

The Hahnemann Medical College and Hospital Philadelphia

JAMA. 1979;241(14):1461-1462. doi:10.1001/jama.1979.03290400021007

To the Editor.—  This letter is in reference to the article, "Discrepancies Between Iodine and Technetium Thyroid Scintigraphy," by Barth et al (240:463, 1978).I have reviewed this article again following publication of the corrections in The Journal (240:1340,1978). The illustrations are upside down. Figure 1 should be reversed with Fig 4, and Fig 2 should be reversed with Fig 3. However, the legends to the illustrations are correct after the figures have been repositioned. There are still several things that disturb me concerning the cases presented.In case 1, a barely minimal scanning dose of radionuclides was used. The 20-minute uptake of technetium in a normal thyroid gland is in the range of 4%,1 which would make the scanning dose of technetium Tc 99m 20 μCi or less. If the scan using iodine 131 was performed at the 24- or 48-hour interval, the scanning dose was in the range