Canine osteosarcoma: Case report

Abstract

Canine osteosarcoma: Case report
ABSTRACT. Osteosarcoma is one of the most common malignant bone tumors in dogs, and in this species more than 80% of malignant bone neoplasms are osteosarcomas. The occurrence of this disease is greater in dogs with 5 to 9 years, with a peak around 7 years, but it can also be observed in young dogs, at 1 year of age. In large breeds the incidence is higher and both sexes are equally affected. Osteosarcoma also occurs in cats, but is less common than in dogs, and the development of metastases is slower. The etiology of canine osteosarcoma remains unknown. The first symptoms to be observed are lameness and extensive painful volume increase in the tumor focus. The diagnosis is based on the history, physical examination, laboratory examination, scintigraphy and mainly radiographic findings, showing areas of bone destruction, bone neoformation, indefinite contour, periosteal reaction (in some cases in "sun rays") and increase in tissue volume The biopsy and histopathological examination were confirmed. The treatments can be with chemotherapy, radiotherapy, surgery for amputation of the affected limb and surgery with limb preservation. The prognosis is usually poor, but will depend on the species, the breed and the response to treatment.