TUMORES MAMÁRIOS EM CÃES – ESTUDO RETROSPECTIVO PATRÍCIA

Abstract

Mammary neoplasias represent approximately half of the tumors observed in dogs, among them, 50% are malignant. Most part of tumors affects females between 8 and 10 years old, however, tumors in animals under 5 years old can occur, without breed preference. The animals affected by tumors are intact females or females that underwent a late ovariohysterectomy, being rare in males and young animals of both sexes. When ovariohysterectomy is done before 2 years and half of age it has a protector effect against the risk of developing mammary tumors. The influence of progesterone administration on mammary tumors development is related to the prolonged treatment and high doses. Mastectomy is the indicated treatment, except for neoplasias with metastasizing behavior. Definitive diagnosis of the type of neoplasia involved is possible through histopathological examination. In the present study, data from 17 bitches with history of mammary tumors was collected from January and December 2014. For histopathological classification, all growth disturbances of the mammary gland, including neoplastic conditions (benign and malignant neoplasms) and non-neoplastic conditions (hyperplastic conditions) are considered as mammary tumors. Fifteen bitches were known breed dogs (six Poodles, five Pinschers, two Rottweilers, one German Shepard and one cocker spaniel) and two bitches were mixed-breed dogs. Seven bitches were considered senior dogs and 10 as adults. Mastectomy and spaying was performed in all bitches. Based on the histopathological data, 88% of the cases were malignant neoplasias, all were carcinoma type.