Avaliação histopatológica de lesões de glândula mamária em gatas diagnosticadas no laboratório de patologia da SUHVU no período de 2017 até 2023

Abstract

In Veterinary Pathology, breast cancer in cats has been highlighted due to the large number of cases of the condition. Breast neoplasms are mostly malignant, in around 80% of cases, and manifest in very variable ways, being a complicating factor for clinical diagnosis. Thus, the objective of this work was to evaluate mammary gland lesions in cats. Mammary nodules and mammary chains were evaluated, coming from the Superintendence of the University Veterinary Hospital Unit (SUHVU) sent to the Veterinary Pathology Laboratory of the SUHVU of the Federal University of Fronteira Sul (UFFS). It was found that the epidemiological profile of felines with diagnosed mammary changes were females, with an average age of 9.7 years, predominantly without defined breed, and all received exogenous hormones. Macroscopically, all neoformations received followed the non-ulcerated pattern. Among the non-neoplastic changes, fibroadenomatous hyperplasia was the most observed, and in relation to neoplastic changes, 90% were malignant neoplasms, with the most recurrent pattern being tubular carcinoma (41%), followed by tubulopapillary carcinoma (35%). The majority of the regional lymph nodes (67%) had the presence of neoplastic cells associated with the lymphoid tissue. It is concluded that the high level of malignancy of feline mammary neoplasms is evident and the importance of evaluating regional lymph nodes to detect metastases is highlighted, considering the high level of neoplastic cells detected in the present study.