Year 2017 - Volume 37, Number 12


Title
Thyroid neoplasms in dogs: 26 cases, 37(12):1460-1466
Authors

Abstract
ABSTRACT.- Tochetto C., Silva T.M., Fighera R.A., Irigoyen L.F & Kommers G.D. 2017. [Thyroid neoplasms in dogs: 26 cases.] Neoplasmas da tireoide em cães: 26 casos. Pesquisa Veterinária Brasileira 37(12):1460-1466. Departamento de Patologia, Centro de Ciências da Saúde, Universidade Federal de Santa Maria, Av. Roraima 1000, Santa Maria, RS 97105-900, Brazil. E-mail: camilatochetto@yahoo.com.br

Biopsy and necropsy reports of the Laboratório de Patologia Veterinária at the Universidade Federal de Santa Maria (LPV/UFSM) were reviewed, including data from 2004 to 2014; all cases of the thyroid tumors were selected. From this point on, it was recorded the gender, age and breed of affected dogs. Additionally, it was evaluated the clinical significance of these tumors, presence of cervical swelling, affected lobes, tumors size, presence and location of metastasis and histological pattern of neoplasms. Twenty six thyroid tumors were diagnosed in the study period (four came from biopsies while the other 22 were from necropsies). Of the affected dogs, 53.8% were females and 46.2% were males; most of the animals (65.4%) were purebred. Of these, Boxers were the most affected (15.4%). In 23 protocols the age was informed; 60.9% of the dogs were elderly and 39.1% were adults. The protocols evaluation allowed establishing that 38.5% of the animals had cervical swelling, at the time of clinical examination. Out of the dogs necropsied, only 13.6% died or were euthanized due to complications caused by metastases of thyroid tumors. Thus, in 86.4% of the dogs, the neoplasms were considered as incidental necropsy findings. In the four cases from biopsy samples, the outcomes were not known. There were no tumors causing clinical syndrome in these dogs, due to thyroid hypo- or hyperfunction. In 24 protocols it was found information about the affected lobes, indicating that 75% of the dogs had unilateral glandular involvement. The histological diagnosis showed that 16 (61.5%) neoplasms were follicular cell carcinomas (in these cases, the follicular-compact pattern was the most frequent [43.8%]); 6 (23.1%) were follicular cells adenoma; two (7.7%) were carcinosarcomas and two (7.7%) were C cells tumors (adenoma and carcinoma)
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Colégio Brasileiro de Patologia Animal CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico Coordenação de Aperfeiçoamento de Pessoal de Nível Superior ISI Web of Knowledge SciELO - Scientific Electronic Library Online Banco de Dados Bibliográficos da USP UnB - Universidade de Brasília UFRRJ - Universidade Federal Rural do Rio de Janeiro CFMV - Conselho Federal de Medicina Veterinária