Combined-type Osteosarcoma with Lung Metastasis in a Dog Skull

Combined-Type Osteosarcoma with Lung Metastasis in a Dog Skull

Osteosarcoma is a rapidly growing, metastatic tumor of bone, which is the most common tumor type of all malignant bone tumors in dogs. It is most often seen in large breed, older dogs and tumor size is prognostic (the larger the tumor, the worst the prognosis). The aim of this report was to evaluate clinical, radiological, tomographical and histopathological findings of combined-type osteosarcoma with lung metastasis in a dog skull. An 11 year-old, male, mongrel dog was presented with a large hard mass on its left half of the head which involved frontal, temporal and occipital regions. Its general condition was good. In radiological examination, the mass with regular margin and bone opacity, which originated from occipito-temporal calvarium was determined. Its size was nearly the same with the latero-lateral view of the animal skull. In thorax radiograpy, there were many masses having the same opacity in lungs. Computed tomography showed a large well defined granular, non-homogeneous mass with bone opacity occupying the frontal region (from the frontal bone through the occipital bone, to include both temporal bones). Different size masses with bone opacity were seen in computed tomography of pulmonary metastases. Surgery was decided but the patient had died under general anesthesia. Histopathological findings revealed that masses both in skull and lungs were combined type osteosarcoma. […]