Retrospective study of mammary gland neoplasms in canines between 2004-2011
DOI:
https://doi.org/10.22579/20112629.788Keywords:
Canids, carcinoma, mammary neoplasms animal, osteosarcomaAbstract
Objective. To describe and histopathologically classify mammary gland diseases in canines. Materials and Methods. A retrospective study of the cases filed in the Veterinary Histopathology Laboratory of the Universidad de los Llanos (HistoPat-VetLab) corresponding to mammary gland neoplasms between 2004-2011 was carried out. The variables analyzed were origin, age, breed, age and tumor characterization. Descriptive statistics and Chi-2 categorical analysis were performed. Results. Of 335 cases received, 47 (14.03%) were consistent with mammary gland disease and 20 were diagnosed by histopathology; affected animals were mostly of urban origin (n=16, 80%, p=0.0139) and in total, 16/20 cases corresponded to neoplasms (80%, p<0.0001). Mainly geriatric patients (older than 7 years) were most affected (n=10, 62.5%, p=0.0106), as well as animals of indeterminate breeds (n=8,47%,p=0.0156), followed by French Poodles (n=3, 18%) and Samoyeds (n=2, 12%), other breeds (n=3, 23%). The neoplastic origin was predominantly epithelial (n=15, 93.75% p=0.0012); 9 cases were simple carcinomas (56.25%, p=0.0468): 7 were solid and 2 tubulo-papillary (p=0.182); and 6 were complex carcinomas (37. 5%): 5 tubulo-papillary and 1 solid (p=0.2207); the grading of neoplasms of epithelial origin was: Grade I (n=8, 53.5%, p=0.2466), Grade II (n=4) and Grade III (n=3) without significant preference; 1 case of osteosarcoma was also reported. Conclusions. The majority of cases occurred in geriatric patients. Mammary neoplasms had a higher incidence in animals of indeterminate breeds, with those of epithelial Grade I origin being the most relevant. The most common histological pattern was simple solid carcinoma.
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