This report describes the use of 99mtechnetium pertechnetate (99mTcO4−) and 131[for imaging of a metastatic thyroid carcinoma in a dog. The 131] imaging showed metastatic lesions undetected by the 99mTcO4− imaging on 2 separate occasions. The possible mechanisms for the discrepancies between 131I and 99mTcO4− imaging of thyroid carcinomas are discussed. The use of 131I for the imaging of functional thyroid carcinomas in the dog is recommended.
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Broome et al. (1993) studied this question.
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