Importância da avaliação da margem cirúrgica em mastocitoma de cães atendidos no Hospital Veterinário da Universidade Federal de Uberlândia

Abstract

Canine mast cell tumor is one of the most common cutaneous neoplasms in dogs. Elective treatment is the surgical treatment and maintenance of free margins is necessary to avoid relapses and metastases. Considering the need to ensure a surgical excision with sufficient margins to prevent recurrence and, at the same time, avoid unnecessarily aggressive procedures, the present study verified the role of surgical margins as a factor of patient prognosis, correlating the presence of compromised margins or free with clinic-pathological variables and survival of dogs with mastocytoma. Thirty cases of dogs with mastocytoma were selected, with information on race, sex, age, location, histological grade, macroscopic aspect of lesions and type of margin (small, compromised or free). There was no gender and race influence on the occurrence of mastocytoma, although most dogs were undefined. Animals older than 8 years were the most affected and the trunk was the region with the highest occurrence of tumors. As for grade 63.4% of mast cell tumors was grade II. Free margins were observed in 30% of dogs, small margins in 16.7% and compromised in 53.3%. The mean of the total survival was 251.14 ± 235.49 days and no correlation was found between the type of surgical margin and the survival of the animal. However, compromised margins were more frequent in older animals, and it may be stated that the tumor tends to be more invasive in older dogs. Thus, less aggressive procedures can be adopted in the case of mastocytoma, especially when dealing with low-grade tumors.