Morphological and immunohistological characteristics of follicular-compact thyroid carcinoma in dog.

The case of a 14-year-old mongrel dog with a thyroid tumor treated by thyreoidectomy is described. The resected tumor was subjected to a detailed morphological and immunohistochemical analysis utilizing antibodies directed against thyroglobulin, calcitonin, chromogranin A, cytokeratin 19, thyroid transcription factor-1, CD31, Ki-67 and minichromosome maintenance protein 3. Expression level of the above mentioned antigens allowed to characterize the resected tumor as thyroid follicular-compact carcinoma.