Nuklearmedizin 1976; 15(06): 268-272
DOI: 10.1055/s-0038-1624975
Originalarbeiten — Original Articles
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Some Comparative Studies Using 99mTc and 131I in Thyroid Scanning

T. Górowski
1   From the Department of Thyroid Diseases, Endocrinology Clinic, Postgraduate Medical School (Head: Prof. W. Hartwig), Warsaw
,
O. A. Chomicki
1   From the Department of Thyroid Diseases, Endocrinology Clinic, Postgraduate Medical School (Head: Prof. W. Hartwig), Warsaw
› Author Affiliations
Further Information

Publication History

Received:14 September 1976

Publication Date:
10 January 2018 (online)

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Summary

By comparing thyroid scans made with 99mTc and 131I in 40 euthyroid goiter patients large discrepancies were found in 20% of all cases. For example, “warm” nodules on 99mTc scans were found to be “cold” on 131I scans, or a “cold” nodule on a 99mTc scan was observed as a “warm” one on a 131I scan. The above discrepancies seem to result from the differences in the metabolism of the two radioisotopes in the thyroid and those in the time which elapsed between the administration of the radioisotope and the execution of the scan.

Generally speaking 99mTc thyroid scintigraphy should not be recommended as a routine technique in adults, its usefulness being limited to the cases in which 131I scans were found to be illegible. “Cold” nodules on 99mTc scans should also be reexamined after T3 stimulation.