Histopathological features of mammary gland tumors in native domestic female cats from the State of Rio Grande do Norte, Brazil
Filgueira, Kilder DantasMacêdo, Luã Barbalho deOliveira, Ilanna Vanessa Pristo de MedeirosPimentel, Muriel Magda LustosaReis, Paulo Fernando Cisneiros da CostaReche Júnior, Archivaldo
Background: There is in Brazil little information about histopathological features of feline mammary neoplasms. Especially in some Brazilian Northeastern locations such as Rio Grande do Norte (RN), there is complete absence of data regarding feline mammary neoplasm microscopy. Accordingly, this study aimed to describe the histopathology of mammary gland tumors in native domestic cats from the state of RN, Brazil.Materials, Methods & Results: Records of 26 feline females, carriers of mammary neoplasms, were analyzed. Files from Veterinary Hospital of the Federal Rural University of Semi-Arid (located in the city of Mossoró, RN, Brazil) were used, comprehending the period from December 2004 to August 2009. The information collected was related to mammary tumor microscopic findings, obtained from classical histopathology reports. The lesions were distributed according to their biological behavior. Histological classification and morphological differentiation degree were also considered. Data related to neoplastic infiltration in adjacent tumoral regions were obtained as well. Descriptive statistic data were performed and submitted in percentage form. It was observed that most tumors (92%) exhibited malignant biological behavior. All of those were classified as carcinomas and, among the ones presenting benign behavior, intraductal papilloma was diagnosed. As referred to malignancies, the most common histological type corresponded to papillary carcinoma (42%). For morphological differentiation degree of mammary carcinomas, grade II presented the highest percentage (54%). Local tumor infiltration occurred mainly to the skin (75%).Discussion: It has been reported that, among the palpable mammary masses in cats, 82% corresponded to malignancies and 10% were benign neoplasms.[...](AU)
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