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Keywords:

  • horse;
  • carcinoma;
  • 99mTc-sestamibi;
  • 99mTc-pertechnetate;
  • scintigraphy;
  • thyroid

Summary

A 15-year-old Boerperd stallion presented for thyroid enlargement associated with inappetance. Ultrasonographic examination of the thyroid gland revealed an enlarged left lobe, which, on cytological examination, contained numerous anaplastic cells. A mixed C cell microfollicular thyroid carcinoma was diagnosed following histopathological examination of the excisional biopsy specimen. In order to determine metastasis, pulmonary radiographs revealed a poorly-marginated soft tissue opacity caudo-dorsal to the cardiac silhouette. Thyroid and pulmonary scintigraphy was performed comparing 99mTc-sestamibi with 99mTc-pertechnetate and no metastasis was detectable. Following hemithyroidectomy, the stallion made a full recovery without the need for neoadjuvant chemotherapy. Six months later, repeated thyroid and pulmonary scintigraphy using 99mTc-sestamibi was normal.