Abstract
Thyroid scanning was performed in 135 hyperthyroid cats and 13 normal cats with technetium‐99m as pertechnetate (99mTcO4) or with radioactive iodine (131I). Of the hyperthyroid cats, enlargement and increased radionuclide accumulation were found in one thyroid lobe in 38 (27%) and in both lobes in 97 (73%). In two hyperthyroid cats with thyroid carcinoma, extension of tumor into the thoracic cavity was detected. In normal and hyperthyroid cats the radionuclide images produced with 99mTcO4 and 131I were similar; however, the quality of the 99mTcO4 scans was usually better than that of the 131I scans.
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